Build book from commit 1f9a5f410e [skip ci]

advanced/composing_routers.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
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+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
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@@ -1124,7 +1137,7 @@
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 </div>

advanced/configuring_routers.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
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+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
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+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
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advanced/dev_workflow.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
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+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
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+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
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@@ -889,7 +902,7 @@
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advanced/different_routers.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
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+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
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+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
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+                </a>
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+
+            
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@@ -837,7 +850,7 @@
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advanced/route_validation.html

@@ -511,6 +511,19 @@
             
 
             
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+                <a href="../http/transforming_interceptor_chain.html">
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+                    
+                    Transforming Interceptor Chain
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+            
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@@ -925,7 +938,7 @@
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advanced/shared_routes.html

@@ -511,6 +511,19 @@
             
 
             
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+                    
+                    Transforming Interceptor Chain
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+            
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basics/name_based_routing.html

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basics/path_based_routing.html

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basics/route_conflicts.html

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basics/route_data.html

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basics/route_data_validation.html

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basics/route_syntax.html

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basics/router.html

@@ -511,6 +511,19 @@
             
 
             
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cljdoc.edn

@@ -40,7 +40,8 @@
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    ["Browser integration" {:file "doc/frontend/browser.md"}]

coercion/clojure_spec_coercion.html

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coercion/coercion.html

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coercion/data_spec_coercion.html

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coercion/schema_coercion.html

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development.html

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faq.html

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frontend/basics.html

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frontend/browser.html

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         });
     </script>
 </div>

frontend/controllers.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -879,7 +892,7 @@ missing resources.</p>
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
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         });
     </script>
 </div>

http/default_interceptors.html

@@ -61,7 +61,7 @@
     <link rel="shortcut icon" href="../gitbook/images/favicon.ico" type="image/x-icon">
 
     
-    <link rel="next" href="../frontend/basics.html" />
+    <link rel="next" href="transforming_interceptor_chain.html" />
     
     
     <link rel="prev" href="sieppari.html" />
@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="transforming_interceptor_chain.html">
+            
+                <a href="transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -792,7 +805,7 @@
                 </a>
                 
                 
-                <a href="../frontend/basics.html" class="navigation navigation-next " aria-label="Next page: Basics">
+                <a href="transforming_interceptor_chain.html" class="navigation navigation-next " aria-label="Next page: Transforming Interceptor Chain">
                     <i class="fa fa-angle-right"></i>
                 </a>
                 
@@ -803,7 +816,7 @@
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Default Interceptors","level":"5.4","depth":1,"next":{"title":"Basics","level":"6.1","depth":1,"path":"frontend/basics.md","ref":"frontend/basics.md","articles":[]},"previous":{"title":"Sieppari","level":"5.3","depth":1,"path":"http/sieppari.md","ref":"http/sieppari.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"http/default_interceptors.md","mtime":"2018-12-27T14:54:09.602Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-27T14:54:31.557Z"},"basePath":"..","book":{"language":""}});
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         });
     </script>
 </div>

http/interceptors.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="transforming_interceptor_chain.html">
+            
+                <a href="transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -743,10 +756,46 @@
 <p>An module for http-routing using interceptors instead of middleware. Builds on top of the <a href="../ring/ring.html"><code>reitit-ring</code></a> module having all the same features.</p>
 <p>The differences:</p>
 <ul>
-<li>instead of <code>:middleware</code>, uses <code>:interceptors</code>.</li>
+<li><code>:interceptors</code> key in used in route data instead of <code>:middleware</code></li>
-<li><code>reitit.http/http-router</code> requires an extra option <code>:executor</code> of type <code>reitit.interceptor/Executor</code>.</li>
+<li><code>reitit.http/http-router</code> requires an extra option <code>:executor</code> of type <code>reitit.interceptor/Executor</code> to execute the interceptor chain<ul>
-<li>instead of creating a ring-handler, apps can be wrapped into a routing interceptor that enqueues the matched interceptors into the context. For this, there is <code>reitit.http/routing-interceptor</code>.</li>
+<li>optionally, a routing interceptor can be used - it enqueues the matched interceptors into the context. See <code>reitit.http/routing-interceptor</code> for details.</li>
 </ul>
+</li>
+</ul>
+<h2 id="simple-example">Simple example</h2>
+<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
+(<span class="hljs-name">require</span> &apos;[reitit.http <span class="hljs-symbol">:as</span> http])
+(<span class="hljs-name">require</span> &apos;[reitit.interceptor.sieppari <span class="hljs-symbol">:as</span> sieppari])
+
+(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> interceptor [number]
+  {<span class="hljs-symbol">:enter</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [ctx] (<span class="hljs-name"><span class="hljs-builtin-name">update-in</span></span> ctx [<span class="hljs-symbol">:request</span> <span class="hljs-symbol">:number</span>] (<span class="hljs-name">fnil</span> + <span class="hljs-number">0</span>) number))})
+
+(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
+  (<span class="hljs-name">http/ring-handler</span>
+    (<span class="hljs-name">http/router</span>
+      [<span class="hljs-string">&quot;/api&quot;</span>
+       {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">1</span>)]}
+
+       [<span class="hljs-string">&quot;/number&quot;</span>
+        {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">10</span>)]
+         <span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">100</span>)]
+               <span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [req]
+                          {<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
+                           <span class="hljs-symbol">:body</span> (<span class="hljs-name"><span class="hljs-builtin-name">select-keys</span></span> req [<span class="hljs-symbol">:number</span>])})}}]])
+
+    <span class="hljs-comment">;; the default handler</span>
+    (<span class="hljs-name">ring/create-default-handler</span>)
+
+    <span class="hljs-comment">;; executor</span>
+    {<span class="hljs-symbol">:executor</span> sieppari/executor}))
+
+
+(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/&quot;</span>})
+<span class="hljs-comment">; {:status 404, :body &quot;&quot;, :headers {}}</span>
+
+(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/number&quot;</span>})
+<span class="hljs-comment">; {:status 200, :body {:number 111}}</span>
+</code></pre>
 <h2 id="why-interceptors">Why interceptors?</h2>
 <ul>
 <li><a href="https://quanttype.net/posts/2018-08-03-why-interceptors.html" target="_blank">https://quanttype.net/posts/2018-08-03-why-interceptors.html</a></li>
@@ -795,7 +844,7 @@
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Interceptors","level":"5.1","depth":1,"next":{"title":"Pedestal","level":"5.2","depth":1,"path":"http/pedestal.md","ref":"http/pedestal.md","articles":[]},"previous":{"title":"Swagger Support","level":"4.14","depth":1,"path":"ring/swagger.md","ref":"ring/swagger.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"http/interceptors.md","mtime":"2018-12-27T14:54:09.602Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-27T14:54:31.557Z"},"basePath":"..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Interceptors","level":"5.1","depth":1,"next":{"title":"Pedestal","level":"5.2","depth":1,"path":"http/pedestal.md","ref":"http/pedestal.md","articles":[]},"previous":{"title":"Swagger Support","level":"4.14","depth":1,"path":"ring/swagger.md","ref":"ring/swagger.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"http/interceptors.md","mtime":"2018-12-30T15:15:51.720Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-30T15:16:25.202Z"},"basePath":"..","book":{"language":""}});
         });
     </script>
 </div>

http/pedestal.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="transforming_interceptor_chain.html">
+            
+                <a href="transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -757,14 +770,24 @@
 <span class="hljs-comment">; [metosin/reitit-pedestal &quot;0.2.10-alpha1&quot;]</span>
 <span class="hljs-comment">; [metosin/reitit &quot;0.2.10-alpha1&quot;]</span>
 
-(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> example.server
+(<span class="hljs-name">require</span> &apos;[io.pedestal.http <span class="hljs-symbol">:as</span> server])
-  (<span class="hljs-symbol">:require</span> [io.pedestal.http <span class="hljs-symbol">:as</span> server]
+(<span class="hljs-name">require</span> &apos;[reitit.pedestal <span class="hljs-symbol">:as</span> pedestal])
-            [reitit.pedestal <span class="hljs-symbol">:as</span> pedestal]
+(<span class="hljs-name">require</span> &apos;[reitit.http <span class="hljs-symbol">:as</span> http])
-            [reitit.http <span class="hljs-symbol">:as</span> http]
+(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
-            [reitit.ring <span class="hljs-symbol">:as</span> ring]))
+
+(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> interceptor [number]
+  {<span class="hljs-symbol">:enter</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [ctx] (<span class="hljs-name"><span class="hljs-builtin-name">update-in</span></span> ctx [<span class="hljs-symbol">:request</span> <span class="hljs-symbol">:number</span>] (<span class="hljs-name">fnil</span> + <span class="hljs-number">0</span>) number))})
 
 (<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> routes
-  [<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:get</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [_] {<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> <span class="hljs-string">&quot;pong&quot;</span>})}])
+  [<span class="hljs-string">&quot;/api&quot;</span>
+   {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">1</span>)]}
+
+   [<span class="hljs-string">&quot;/number&quot;</span>
+    {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">10</span>)]
+     <span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">100</span>)]
+           <span class="hljs-symbol">:handler</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [req]
+                      {<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
+                       <span class="hljs-symbol">:body</span> (<span class="hljs-name"><span class="hljs-builtin-name">select-keys</span></span> req [<span class="hljs-symbol">:number</span>])})}}]])
 
 (<span class="hljs-name"><span class="hljs-builtin-name">-&gt;</span></span> {<span class="hljs-symbol">::server/type</span> <span class="hljs-symbol">:jetty</span>
      <span class="hljs-symbol">::server/port</span> <span class="hljs-number">3000</span>
@@ -832,7 +855,7 @@
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Pedestal","level":"5.2","depth":1,"next":{"title":"Sieppari","level":"5.3","depth":1,"path":"http/sieppari.md","ref":"http/sieppari.md","articles":[]},"previous":{"title":"Interceptors","level":"5.1","depth":1,"path":"http/interceptors.md","ref":"http/interceptors.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"http/pedestal.md","mtime":"2018-12-27T14:54:09.602Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-27T14:54:31.557Z"},"basePath":"..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Pedestal","level":"5.2","depth":1,"next":{"title":"Sieppari","level":"5.3","depth":1,"path":"http/sieppari.md","ref":"http/sieppari.md","articles":[]},"previous":{"title":"Interceptors","level":"5.1","depth":1,"path":"http/interceptors.md","ref":"http/interceptors.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"http/pedestal.md","mtime":"2018-12-30T15:15:51.720Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-30T15:16:25.202Z"},"basePath":"..","book":{"language":""}});
         });
     </script>
 </div>

http/sieppari.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="transforming_interceptor_chain.html">
+            
+                <a href="transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -843,7 +856,7 @@
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Sieppari","level":"5.3","depth":1,"next":{"title":"Default Interceptors","level":"5.4","depth":1,"path":"http/default_interceptors.md","ref":"http/default_interceptors.md","articles":[]},"previous":{"title":"Pedestal","level":"5.2","depth":1,"path":"http/pedestal.md","ref":"http/pedestal.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"http/sieppari.md","mtime":"2018-12-27T14:54:09.602Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-27T14:54:31.557Z"},"basePath":"..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Sieppari","level":"5.3","depth":1,"next":{"title":"Default Interceptors","level":"5.4","depth":1,"path":"http/default_interceptors.md","ref":"http/default_interceptors.md","articles":[]},"previous":{"title":"Pedestal","level":"5.2","depth":1,"path":"http/pedestal.md","ref":"http/pedestal.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"http/sieppari.md","mtime":"2018-12-30T15:15:51.720Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-30T15:16:25.202Z"},"basePath":"..","book":{"language":""}});
         });
     </script>
 </div>

http/transforming_interceptor_chain.html

@@ -0,0 +1,897 @@
+
+<!DOCTYPE HTML>
+<html lang="" >
+    <head>
+        <meta charset="UTF-8">
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+        <title>Transforming Interceptor Chain · GitBook</title>
+        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+        <meta name="description" content="">
+        <meta name="generator" content="GitBook 3.2.3">
+        
+        
+        
+    
+    <link rel="stylesheet" href="../gitbook/style.css">
+
+    
+            
+                
+                <link rel="stylesheet" href="../gitbook/gitbook-plugin-hints/plugin-hints.css">
+                
+            
+                
+                <link rel="stylesheet" href="../gitbook/gitbook-plugin-highlight/website.css">
+                
+            
+                
+                <link rel="stylesheet" href="../gitbook/gitbook-plugin-search/search.css">
+                
+            
+                
+                <link rel="stylesheet" href="../gitbook/gitbook-plugin-fontsettings/website.css">
+                
+            
+        
+
+    
+
+    
+        
+    
+        
+    
+        
+    
+        
+    
+        
+    
+        
+    
+
+        
+    
+    
+    <meta name="HandheldFriendly" content="true"/>
+    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
+    <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-status-bar-style" content="black">
+    <link rel="apple-touch-icon-precomposed" sizes="152x152" href="../gitbook/images/apple-touch-icon-precomposed-152.png">
+    <link rel="shortcut icon" href="../gitbook/images/favicon.ico" type="image/x-icon">
+
+    
+    <link rel="next" href="../frontend/basics.html" />
+    
+    
+    <link rel="prev" href="default_interceptors.html" />
+    
+
+    </head>
+    <body>
+        
+<div class="book">
+    <div class="book-summary">
+        
+            
+<div id="book-search-input" role="search">
+    <input type="text" placeholder="Type to search" />
+</div>
+
+            
+                <nav role="navigation">
+                
+
+
+<ul class="summary">
+    
+    
+
+    
+
+    
+        
+        <li class="header">Introduction</li>
+        
+        
+    
+        <li class="chapter " data-level="1.1" data-path="../">
+            
+                <a href="../">
+            
+                    
+                    Introduction
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+    
+        
+        <li class="header">Basics</li>
+        
+        
+    
+        <li class="chapter " data-level="2.1" data-path="../basics/route_syntax.html">
+            
+                <a href="../basics/route_syntax.html">
+            
+                    
+                    Route Syntax
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="2.2" data-path="../basics/router.html">
+            
+                <a href="../basics/router.html">
+            
+                    
+                    Router
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="2.3" data-path="../basics/path_based_routing.html">
+            
+                <a href="../basics/path_based_routing.html">
+            
+                    
+                    Path-based Routing
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="2.4" data-path="../basics/name_based_routing.html">
+            
+                <a href="../basics/name_based_routing.html">
+            
+                    
+                    Name-based Routing
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="2.5" data-path="../basics/route_data.html">
+            
+                <a href="../basics/route_data.html">
+            
+                    
+                    Route Data
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="2.6" data-path="../basics/route_data_validation.html">
+            
+                <a href="../basics/route_data_validation.html">
+            
+                    
+                    Route Data Validation
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="2.7" data-path="../basics/route_conflicts.html">
+            
+                <a href="../basics/route_conflicts.html">
+            
+                    
+                    Route Conflicts
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+    
+        
+        <li class="header">Coercion</li>
+        
+        
+    
+        <li class="chapter " data-level="3.1" data-path="../coercion/coercion.html">
+            
+                <a href="../coercion/coercion.html">
+            
+                    
+                    Coercion Explained
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.2" data-path="../coercion/schema_coercion.html">
+            
+                <a href="../coercion/schema_coercion.html">
+            
+                    
+                    Plumatic Schema
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.3" data-path="../coercion/clojure_spec_coercion.html">
+            
+                <a href="../coercion/clojure_spec_coercion.html">
+            
+                    
+                    Clojure.spec
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.4" data-path="../coercion/data_spec_coercion.html">
+            
+                <a href="../coercion/data_spec_coercion.html">
+            
+                    
+                    Data-specs
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+    
+        
+        <li class="header">Ring</li>
+        
+        
+    
+        <li class="chapter " data-level="4.1" data-path="../ring/ring.html">
+            
+                <a href="../ring/ring.html">
+            
+                    
+                    Ring-router
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.2" data-path="../ring/reverse_routing.html">
+            
+                <a href="../ring/reverse_routing.html">
+            
+                    
+                    Reverse-routing
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.3" data-path="../ring/default_handler.html">
+            
+                <a href="../ring/default_handler.html">
+            
+                    
+                    Default handler
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.4" data-path="../ring/slash_handler.html">
+            
+                <a href="../ring/slash_handler.html">
+            
+                    
+                    Slash handler
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.5" data-path="../ring/static.html">
+            
+                <a href="../ring/static.html">
+            
+                    
+                    Static Resources
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.6" data-path="../ring/dynamic_extensions.html">
+            
+                <a href="../ring/dynamic_extensions.html">
+            
+                    
+                    Dynamic Extensions
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.7" data-path="../ring/data_driven_middleware.html">
+            
+                <a href="../ring/data_driven_middleware.html">
+            
+                    
+                    Data-driven Middleware
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.8" data-path="../ring/transforming_middleware_chain.html">
+            
+                <a href="../ring/transforming_middleware_chain.html">
+            
+                    
+                    Transforming Middleware Chain
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.9" data-path="../ring/middleware_registry.html">
+            
+                <a href="../ring/middleware_registry.html">
+            
+                    
+                    Middleware Registry
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.10" data-path="../ring/default_middleware.html">
+            
+                <a href="../ring/default_middleware.html">
+            
+                    
+                    Default Middleware
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.11" data-path="../ring/coercion.html">
+            
+                <a href="../ring/coercion.html">
+            
+                    
+                    Pluggable Coercion
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.12" data-path="../ring/route_data_validation.html">
+            
+                <a href="../ring/route_data_validation.html">
+            
+                    
+                    Route Data Validation
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.13" data-path="../ring/compiling_middleware.html">
+            
+                <a href="../ring/compiling_middleware.html">
+            
+                    
+                    Compiling Middleware
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="4.14" data-path="../ring/swagger.html">
+            
+                <a href="../ring/swagger.html">
+            
+                    
+                    Swagger Support
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+    
+        
+        <li class="header">HTTP</li>
+        
+        
+    
+        <li class="chapter " data-level="5.1" data-path="interceptors.html">
+            
+                <a href="interceptors.html">
+            
+                    
+                    Interceptors
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="5.2" data-path="pedestal.html">
+            
+                <a href="pedestal.html">
+            
+                    
+                    Pedestal
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="5.3" data-path="sieppari.html">
+            
+                <a href="sieppari.html">
+            
+                    
+                    Sieppari
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="5.4" data-path="default_interceptors.html">
+            
+                <a href="default_interceptors.html">
+            
+                    
+                    Default Interceptors
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter active" data-level="5.5" data-path="transforming_interceptor_chain.html">
+            
+                <a href="transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+    
+        
+        <li class="header">Frontend</li>
+        
+        
+    
+        <li class="chapter " data-level="6.1" data-path="../frontend/basics.html">
+            
+                <a href="../frontend/basics.html">
+            
+                    
+                    Basics
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="6.2" data-path="../frontend/browser.html">
+            
+                <a href="../frontend/browser.html">
+            
+                    
+                    Browser integration
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="6.3" data-path="../frontend/controllers.html">
+            
+                <a href="../frontend/controllers.html">
+            
+                    
+                    Controllers
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+    
+        
+        <li class="header">Advanced</li>
+        
+        
+    
+        <li class="chapter " data-level="7.1" data-path="../advanced/configuring_routers.html">
+            
+                <a href="../advanced/configuring_routers.html">
+            
+                    
+                    Configuring Routers
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="7.2" data-path="../advanced/composing_routers.html">
+            
+                <a href="../advanced/composing_routers.html">
+            
+                    
+                    Composing Routers
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="7.3" data-path="../advanced/different_routers.html">
+            
+                <a href="../advanced/different_routers.html">
+            
+                    
+                    Different Routers
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="7.4" data-path="../advanced/route_validation.html">
+            
+                <a href="../advanced/route_validation.html">
+            
+                    
+                    Route Validation
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="7.5" data-path="../advanced/dev_workflow.html">
+            
+                <a href="../advanced/dev_workflow.html">
+            
+                    
+                    Dev Workflow
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="7.6" data-path="../advanced/shared_routes.html">
+            
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+                    Shared Routes
+            
+                </a>
+            
+
+            
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+    
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+        
+        
+    
+        <li class="chapter " data-level="8.1" data-path="../performance.html">
+            
+                <a href="../performance.html">
+            
+                    
+                    Performance
+            
+                </a>
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+
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+    <h1>
+        <i class="fa fa-circle-o-notch fa-spin"></i>
+        <a href=".." >Transforming Interceptor Chain</a>
+    </h1>
+</div>
+
+
+
+
+                    <div class="page-wrapper" tabindex="-1" role="main">
+                        <div class="page-inner">
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+<div id="book-search-results">
+    <div class="search-noresults">
+    
+                                <section class="normal markdown-section">
+                                
+                                <h1 id="transforming-the-interceptor-chain">Transforming the Interceptor Chain</h1>
+<p>There is an extra option in http-router (actually, in the underlying interceptor-router): <code>:reitit.interceptor/transform</code> to transform the interceptor chain per endpoint. Value should be a function or a vector of functions that get a vector of compiled interceptors and should return a new vector of interceptors.</p>
+<p><strong>Note:</strong> the last interceptor in the chain is usually the handler, compiled into an Interceptor. Applying a tranfromation <code>clojure.core/reverse</code> would put this interceptor into first in the chain, making the rest of the interceptors effectively unreachable. There is a helper <code>reitit.interceptor/transform-butlast</code> to transform all but the last interceptor.</p>
+<h2 id="example-application">Example Application</h2>
+<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.http <span class="hljs-symbol">:as</span> http])
+(<span class="hljs-name">require</span> &apos;[reitit.interceptor.sieppari <span class="hljs-symbol">:as</span> sieppari])
+
+(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> interceptor [message]
+  {<span class="hljs-symbol">:enter</span> (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [ctx] (<span class="hljs-name"><span class="hljs-builtin-name">update-in</span></span> ctx [<span class="hljs-symbol">:request</span> <span class="hljs-symbol">:message</span>] (<span class="hljs-name">fnil</span> conj []) message))})
+
+(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> handler [req]
+  {<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>
+   <span class="hljs-symbol">:body</span> (<span class="hljs-name"><span class="hljs-builtin-name">select-keys</span></span> req [<span class="hljs-symbol">:message</span>])})
+
+(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
+  (<span class="hljs-name">http/ring-handler</span>
+    (<span class="hljs-name">http/router</span>
+      [<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">1</span>) (<span class="hljs-name">interceptor</span> <span class="hljs-number">2</span>)]}
+       [<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">3</span>)]
+                       <span class="hljs-symbol">:handler</span> handler}}]])
+    {<span class="hljs-symbol">:executor</span> sieppari/executor}))
+
+(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
+<span class="hljs-comment">; {:status 200, :body {:message [1 2 3]}}</span>
+</code></pre>
+<h3 id="reversing-the-interceptor-chain">Reversing the Interceptor Chain</h3>
+<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
+  (<span class="hljs-name">http/ring-handler</span>
+    (<span class="hljs-name">http/router</span>
+      [<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">1</span>) (<span class="hljs-name">interceptor</span> <span class="hljs-number">2</span>)]}
+       [<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">3</span>)]
+                       <span class="hljs-symbol">:handler</span> handler}}]]
+      {<span class="hljs-symbol">::interceptor/transform</span> (<span class="hljs-name">interceptor/transform-butlast</span> reverse)})
+    {<span class="hljs-symbol">:executor</span> sieppari/executor}))
+
+(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
+<span class="hljs-comment">; {:status 200, :body {:message [3 2 1]}}</span>
+</code></pre>
+<h3 id="interleaving-interceptors">Interleaving Interceptors</h3>
+<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
+  (<span class="hljs-name">http/ring-handler</span>
+    (<span class="hljs-name">http/router</span>
+      [<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">1</span>) (<span class="hljs-name">interceptor</span> <span class="hljs-number">2</span>)]}
+       [<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:interceptors</span> [(<span class="hljs-name">interceptor</span> <span class="hljs-number">3</span>)]
+                       <span class="hljs-symbol">:handler</span> handler}}]]
+      {<span class="hljs-symbol">::interceptor/transform</span> #(<span class="hljs-name">interleave</span> % (<span class="hljs-name"><span class="hljs-builtin-name">repeat</span></span> (<span class="hljs-name">interceptor</span> <span class="hljs-symbol">:debug</span>)))})
+    {<span class="hljs-symbol">:executor</span> sieppari/executor}))
+
+(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
+<span class="hljs-comment">; {:status 200, :body {:message [1 :debug 2 :debug 3 :debug]}}</span>
+</code></pre>
+<h3 id="printing-context-diffs">Printing Context Diffs</h3>
+<pre><code class="lang-clj">[metosin/reitit-interceptors <span class="hljs-string">&quot;0.2.9&quot;</span>]
+</code></pre>
+<p>Using <code>reitit.http.interceptors.dev/print-context-diffs</code> transformation, the context diffs between each interceptor are printed out to the console. To use it, add the following router option:</p>
+<pre><code class="lang-clj">:reitit.interceptor/transform reitit.http.interceptor.dev/print-context-diffs
+</code></pre>
+<p>Sample output:</p>
+<p><img src="../images/http-context-diff.png" alt="Http Context Diff"></p>
+
+                                
+                                </section>
+                            
+    </div>
+    <div class="search-results">
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index.html

@@ -509,6 +509,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="http/transforming_interceptor_chain.html">
+            
+                <a href="http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
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@@ -930,7 +943,7 @@
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 </div>

performance.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="http/transforming_interceptor_chain.html">
+            
+                <a href="http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
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 </div>

ring/coercion.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
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 </div>

ring/compiling_middleware.html

@@ -511,6 +511,19 @@
             
 
             
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+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -841,7 +854,7 @@
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 </div>

ring/data_driven_middleware.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
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+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -869,7 +882,7 @@
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 </div>

ring/default_handler.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
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+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -847,7 +860,7 @@
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 </div>

ring/default_middleware.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -740,16 +753,17 @@
 </code></pre>
 <p>Any Ring middleware can be used with <code>reitit-ring</code>, but using data-driven middleware is preferred as they are easier to manage and in many cases, yield better performance. <code>reitit-middleware</code> contains a set of common ring middleware, lifted into data-driven middleware.</p>
 <ul>
-<li><a href="#parameters-handling">Parameter handling</a></li>
+<li><a href="#parameters-handling">Parameter Handling</a></li>
-<li><a href="#exception-handling">Exception handling</a></li>
+<li><a href="#exception-handling">Exception Handling</a></li>
-<li><a href="#content-negotiation">Content negotiation</a></li>
+<li><a href="#content-negotiation">Content Negotiation</a></li>
-<li><a href="#multipart-request-handling">Multipart request handling</a></li>
+<li><a href="#multipart-request-handling">Multipart Request Handling</a></li>
+<li><a href="#inspecting-requests">Inspecting Requests</a></li>
 </ul>
-<h2 id="parameters-handling">Parameters handling</h2>
+<h2 id="parameters-handling">Parameters Handling</h2>
 <p><code>reitit.ring.middleware.parameters/parameters-middleware</code> to capture query- and form-params. Wraps
 <code>ring.middleware.params/wrap-params</code>.</p>
 <p><strong>NOTE</strong>: will be factored into two parts: a query-parameters middleware and a Muuntaja format responsible for the the <code>application/x-www-form-urlencoded</code> body format.</p>
-<h2 id="exception-handling">Exception handling</h2>
+<h2 id="exception-handling">Exception Handling</h2>
 <p>A polished version of <a href="https://github.com/metosin/compojure-api" target="_blank">compojure-api</a> exception handling. Catches all exceptions and invokes configured exception handler.</p>
 <pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring.middleware.exception <span class="hljs-symbol">:as</span> exception])
 </code></pre>
@@ -945,7 +959,7 @@ Server: Jetty(9.2.21.v20170120)
 
 &lt;kikka&gt;kukka&lt;/kikka&gt;
 </code></pre>
-<h2 id="multipart-request-handling">Multipart request handling</h2>
+<h2 id="multipart-request-handling">Multipart Request Handling</h2>
 <p>Wrapper for <a href="https://github.com/ring-clojure/ring/blob/master/ring-core/src/ring/middleware/multipart_params.clj" target="_blank">Ring Multipart Middleware</a>. Emits swagger <code>:consumes</code> definitions automatically.</p>
 <p>Expected route data:</p>
 <table>
@@ -968,6 +982,12 @@ Server: Jetty(9.2.21.v20170120)
 <li><code>multipart/multipart-middleware</code> a preconfigured middleware for multipart handling</li>
 <li><code>multipart/create-multipart-middleware</code> to generate with custom configuration</li>
 </ul>
+<h2 id="inspecting-requests">Inspecting Requests</h2>
+<p><code>reitit.ring.middleware.dev/print-request-diffs</code> is a <a href="transforming_middleware_chain.html">middleware chain transforming function</a>. It prints a request diff between each middleware. To use it, add the following router option:</p>
+<pre><code class="lang-clj">:reitit.middleware/transform reitit.ring.middleware.dev/print-request-diffs
+</code></pre>
+<p>Partial sample output:</p>
+<p><img src="../images/ring-request-diff.png" alt="Opensensors perf test"></p>
 <h2 id="example-app">Example app</h2>
 <p>See an example app with the default middleware in action: <a href="https://github.com/metosin/reitit/blob/master/examples/ring-swagger/src/example/server.clj" target="_blank">https://github.com/metosin/reitit/blob/master/examples/ring-swagger/src/example/server.clj</a>.</p>
 
@@ -1013,7 +1033,7 @@ Server: Jetty(9.2.21.v20170120)
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ring/dynamic_extensions.html

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ring/middleware_registry.html

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ring/reverse_routing.html

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ring/ring.html

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ring/route_data_validation.html

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         });
     </script>
 </div>

ring/slash_handler.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -850,7 +863,7 @@
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Slash handler","level":"4.4","depth":1,"next":{"title":"Static Resources","level":"4.5","depth":1,"path":"ring/static.md","ref":"ring/static.md","articles":[]},"previous":{"title":"Default handler","level":"4.3","depth":1,"path":"ring/default_handler.md","ref":"ring/default_handler.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"ring/slash_handler.md","mtime":"2018-12-27T14:54:09.606Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-27T14:54:31.557Z"},"basePath":"..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Slash handler","level":"4.4","depth":1,"next":{"title":"Static Resources","level":"4.5","depth":1,"path":"ring/static.md","ref":"ring/static.md","articles":[]},"previous":{"title":"Default handler","level":"4.3","depth":1,"path":"ring/default_handler.md","ref":"ring/default_handler.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"ring/slash_handler.md","mtime":"2018-12-30T15:15:51.732Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-30T15:16:25.202Z"},"basePath":"..","book":{"language":""}});
         });
     </script>
 </div>

ring/static.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -852,7 +865,7 @@
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Static Resources","level":"4.5","depth":1,"next":{"title":"Dynamic Extensions","level":"4.6","depth":1,"path":"ring/dynamic_extensions.md","ref":"ring/dynamic_extensions.md","articles":[]},"previous":{"title":"Slash handler","level":"4.4","depth":1,"path":"ring/slash_handler.md","ref":"ring/slash_handler.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"ring/static.md","mtime":"2018-12-27T14:54:09.606Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-27T14:54:31.557Z"},"basePath":"..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Static Resources","level":"4.5","depth":1,"next":{"title":"Dynamic Extensions","level":"4.6","depth":1,"path":"ring/dynamic_extensions.md","ref":"ring/dynamic_extensions.md","articles":[]},"previous":{"title":"Slash handler","level":"4.4","depth":1,"path":"ring/slash_handler.md","ref":"ring/slash_handler.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"ring/static.md","mtime":"2018-12-30T15:15:51.732Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-30T15:16:25.202Z"},"basePath":"..","book":{"language":""}});
         });
     </script>
 </div>

ring/swagger.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -1071,7 +1084,7 @@ see the next example</li>
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
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+            gitbook.page.hasChanged({"page":{"title":"Swagger Support","level":"4.14","depth":1,"next":{"title":"Interceptors","level":"5.1","depth":1,"path":"http/interceptors.md","ref":"http/interceptors.md","articles":[]},"previous":{"title":"Compiling Middleware","level":"4.13","depth":1,"path":"ring/compiling_middleware.md","ref":"ring/compiling_middleware.md","articles":[]},"dir":"ltr"},"config":{"plugins":["hints","editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"github":{"url":"https://github.com/metosin/reitit"},"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"search":{},"hints":{"danger":"fa fa-exclamation-circle","info":"fa fa-info-circle","tip":"fa fa-mortar-board","working":"fa fa-wrench"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"fontsettings":{"theme":"white","family":"sans","size":2},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"ring/swagger.md","mtime":"2018-12-30T15:15:51.732Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-12-30T15:16:25.202Z"},"basePath":"..","book":{"language":""}});
         });
     </script>
 </div>

ring/transforming_middleware_chain.html

@@ -511,6 +511,19 @@
             
 
             
+        </li>
+    
+        <li class="chapter " data-level="5.5" data-path="../http/transforming_interceptor_chain.html">
+            
+                <a href="../http/transforming_interceptor_chain.html">
+            
+                    
+                    Transforming Interceptor Chain
+            
+                </a>
+            
+
+            
         </li>
     
 
@@ -736,31 +749,60 @@
                                 <section class="normal markdown-section">
                                 
                                 <h1 id="transforming-the-middleware-chain">Transforming the Middleware Chain</h1>
-<p>There is an extra option in ring-router (actually, in the underlying middleware-router): <code>:reitit.middleware/transform</code> to transform the middleware chain per endpoint. It gets the vector of compiled middleware and should return a new vector of middleware.</p>
+<p>There is an extra option in ring-router (actually, in the underlying middleware-router): <code>:reitit.middleware/transform</code> to transform the middleware chain per endpoint. Value should be a function or a vector of functions that get a vector of compiled middleware and should return a new vector of middleware.</p>
-<h2 id="adding-debug-middleware-between-all-other-middleware">Adding debug middleware between all other middleware</h2>
+<h2 id="example-application">Example Application</h2>
+<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.ring <span class="hljs-symbol">:as</span> ring])
+(<span class="hljs-name">require</span> &apos;[reitit.middleware <span class="hljs-symbol">:as</span> middleware])
+
+(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> wrap [handler id]
+  (<span class="hljs-name"><span class="hljs-builtin-name">fn</span></span> [request]
+    (<span class="hljs-name">handler</span> (<span class="hljs-name">update</span> request <span class="hljs-symbol">::acc</span> (<span class="hljs-name">fnil</span> conj []) id))))
+
+(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> handler [{<span class="hljs-symbol">:keys</span> [<span class="hljs-symbol">::acc</span>]}]
+  {<span class="hljs-symbol">:status</span> <span class="hljs-number">200</span>, <span class="hljs-symbol">:body</span> (<span class="hljs-name"><span class="hljs-builtin-name">conj</span></span> acc <span class="hljs-symbol">:handler</span>)})
+
+(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
+  (<span class="hljs-name">ring/ring-handler</span>
+    (<span class="hljs-name">ring/router</span>
+      [<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-number">1</span>] [wrap <span class="hljs-number">2</span>]]}
+       [<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-number">3</span>]]
+                       <span class="hljs-symbol">:handler</span> handler}}]])))
+
+(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
+<span class="hljs-comment">; {:status 200, :body [1 2 3 :handler]}</span>
+</code></pre>
+<h3 id="reversing-the-middleware-chain">Reversing the Middleware Chain</h3>
 <pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
   (<span class="hljs-name">ring/ring-handler</span>
     (<span class="hljs-name">ring/router</span>
-      [<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-number">1</span>] [wrap2 <span class="hljs-number">2</span>]]}
+      [<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-number">1</span>] [wrap <span class="hljs-number">2</span>]]}
-       [<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:middleware</span> [[wrap3 <span class="hljs-number">3</span>]]
+       [<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-number">3</span>]]
                        <span class="hljs-symbol">:handler</span> handler}}]]
-      {<span class="hljs-symbol">::middleware/transform</span> #(<span class="hljs-name">interleave</span> % (<span class="hljs-name"><span class="hljs-builtin-name">repeat</span></span> [wrap <span class="hljs-symbol">:debug</span>]))})))
+      {<span class="hljs-symbol">::middleware/transform</span> reverse})))
-</code></pre>
+
-<pre><code class="lang-clj">(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
+(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
-<span class="hljs-comment">; {:status 200, :body [1 :debug 2 :debug 3 :debug :handler]}</span>
-</code></pre>
-<h2 id="reversing-the-middleware-chain">Reversing the middleware chain</h2>
-<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
-  (<span class="hljs-name">ring/ring-handler</span>
-    (<span class="hljs-name">ring/router</span>
-      [<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-number">1</span>] [wrap2 <span class="hljs-number">2</span>]]}
-       [<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:middleware</span> [[wrap3 <span class="hljs-number">3</span>]]
-                       <span class="hljs-symbol">:handler</span> handler}}]]
-      {<span class="hljs-symbol">::middleware/transform</span> reverse)})))
-</code></pre>
-<pre><code class="lang-clj">(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
 <span class="hljs-comment">; {:status 200, :body [3 2 1 :handler]}</span>
 </code></pre>
+<h2 id="interleaving-middleware">Interleaving Middleware</h2>
+<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> app
+  (<span class="hljs-name">ring/ring-handler</span>
+    (<span class="hljs-name">ring/router</span>
+      [<span class="hljs-string">&quot;/api&quot;</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-number">1</span>] [wrap <span class="hljs-number">2</span>]]}
+       [<span class="hljs-string">&quot;/ping&quot;</span> {<span class="hljs-symbol">:get</span> {<span class="hljs-symbol">:middleware</span> [[wrap <span class="hljs-number">3</span>]]
+                       <span class="hljs-symbol">:handler</span> handler}}]]
+      {<span class="hljs-symbol">::middleware/transform</span> #(<span class="hljs-name">interleave</span> % (<span class="hljs-name"><span class="hljs-builtin-name">repeat</span></span> [wrap <span class="hljs-symbol">:debug</span>]))})))
+
+(<span class="hljs-name">app</span> {<span class="hljs-symbol">:request-method</span> <span class="hljs-symbol">:get</span>, <span class="hljs-symbol">:uri</span> <span class="hljs-string">&quot;/api/ping&quot;</span>})
+<span class="hljs-comment">; {:status 200, :body [1 :debug 2 :debug 3 :debug :handler]}</span>
+</code></pre>
+<h3 id="printing-request-diffs">Printing Request Diffs</h3>
+<pre><code class="lang-clj">[metosin/reitit-middleware <span class="hljs-string">&quot;0.2.9&quot;</span>]
+</code></pre>
+<p>Using <code>reitit.ring.middleware.dev/print-request-diffs</code> transformation, the request diffs between each middleware are printed out to the console. To use it, add the following router option:</p>
+<pre><code class="lang-clj">:reitit.middleware/transform reitit.ring.middleware.dev/print-request-diffs
+</code></pre>
+<p>Sample output:</p>
+<p><img src="../images/ring-request-diff.png" alt="Ring Request Diff"></p>
 
                                 
                                 </section>
@@ -804,7 +846,7 @@
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