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975 lines
30 KiB
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<li class="header">Introduction</li>
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<li class="chapter " data-level="1.1" data-path="../">
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<a href="../">
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Introduction
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Route Syntax
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Router
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Path-based Routing
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<li class="chapter " data-level="2.4" data-path="../basics/name_based_routing.html">
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Name-based Routing
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</a>
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Route Data
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<li class="chapter " data-level="2.6" data-path="../basics/route_data_validation.html">
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<a href="../basics/route_data_validation.html">
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Route Data Validation
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</a>
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</li>
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<li class="chapter " data-level="2.7" data-path="../basics/route_conflicts.html">
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<a href="../basics/route_conflicts.html">
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Route Conflicts
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</a>
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<li class="chapter " data-level="2.8" data-path="../basics/error_messages.html">
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<a href="../basics/error_messages.html">
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Error Messages
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</a>
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</li>
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<li class="header">Coercion</li>
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<li class="chapter " data-level="3.1" data-path="../coercion/coercion.html">
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Coercion Explained
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</a>
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<li class="chapter " data-level="3.2" data-path="../coercion/schema_coercion.html">
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<a href="../coercion/schema_coercion.html">
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Plumatic Schema
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</a>
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<li class="chapter " data-level="3.3" data-path="../coercion/clojure_spec_coercion.html">
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<a href="../coercion/clojure_spec_coercion.html">
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Clojure.spec
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</a>
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<li class="chapter " data-level="3.4" data-path="../coercion/data_spec_coercion.html">
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<a href="../coercion/data_spec_coercion.html">
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Data-specs
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<li class="header">Ring</li>
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<li class="chapter " data-level="4.1" data-path="../ring/ring.html">
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<a href="../ring/ring.html">
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Ring-router
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</a>
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<li class="chapter " data-level="4.2" data-path="../ring/reverse_routing.html">
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<a href="../ring/reverse_routing.html">
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Reverse-routing
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</a>
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</li>
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<li class="chapter " data-level="4.3" data-path="../ring/default_handler.html">
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<a href="../ring/default_handler.html">
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Default handler
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</a>
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</li>
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<li class="chapter " data-level="4.4" data-path="../ring/slash_handler.html">
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<a href="../ring/slash_handler.html">
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Slash handler
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</a>
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</li>
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<li class="chapter " data-level="4.5" data-path="../ring/static.html">
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<a href="../ring/static.html">
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Static Resources
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</a>
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</li>
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<li class="chapter " data-level="4.6" data-path="../ring/dynamic_extensions.html">
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<a href="../ring/dynamic_extensions.html">
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Dynamic Extensions
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</a>
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</li>
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<li class="chapter " data-level="4.7" data-path="../ring/data_driven_middleware.html">
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<a href="../ring/data_driven_middleware.html">
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Data-driven Middleware
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</a>
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</li>
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<li class="chapter " data-level="4.8" data-path="../ring/transforming_middleware_chain.html">
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<a href="../ring/transforming_middleware_chain.html">
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Transforming Middleware Chain
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</a>
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</li>
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<li class="chapter " data-level="4.9" data-path="../ring/middleware_registry.html">
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<a href="../ring/middleware_registry.html">
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Middleware Registry
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</a>
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</li>
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<li class="chapter " data-level="4.10" data-path="../ring/default_middleware.html">
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<a href="../ring/default_middleware.html">
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Default Middleware
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</a>
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</li>
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<li class="chapter " data-level="4.11" data-path="../ring/coercion.html">
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<a href="../ring/coercion.html">
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Ring Coercion
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</a>
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</li>
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<li class="chapter " data-level="4.12" data-path="../ring/route_data_validation.html">
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<a href="../ring/route_data_validation.html">
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Route Data Validation
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</a>
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</li>
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<li class="chapter " data-level="4.13" data-path="../ring/compiling_middleware.html">
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<a href="../ring/compiling_middleware.html">
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Compiling Middleware
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</a>
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</li>
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<li class="chapter " data-level="4.14" data-path="../ring/swagger.html">
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<a href="../ring/swagger.html">
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Swagger Support
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</a>
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</li>
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<li class="chapter " data-level="4.15" data-path="../ring/RESTful_form_methods.html">
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<a href="../ring/RESTful_form_methods.html">
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RESTful form methods
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</a>
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</li>
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<li class="header">HTTP</li>
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<li class="chapter " data-level="5.1" data-path="../http/interceptors.html">
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<a href="../http/interceptors.html">
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Interceptors
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</a>
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</li>
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<li class="chapter " data-level="5.2" data-path="../http/pedestal.html">
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<a href="../http/pedestal.html">
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Pedestal
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</a>
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</li>
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<li class="chapter " data-level="5.3" data-path="../http/sieppari.html">
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<a href="../http/sieppari.html">
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Sieppari
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</a>
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</li>
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<li class="chapter " data-level="5.4" data-path="../http/default_interceptors.html">
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<a href="../http/default_interceptors.html">
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Default Interceptors
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</a>
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</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">
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Transforming Interceptor Chain
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</a>
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</li>
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<li class="header">Frontend</li>
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<li class="chapter " data-level="6.1" data-path="../frontend/basics.html">
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<a href="../frontend/basics.html">
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Basics
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</a>
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</li>
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<li class="chapter " data-level="6.2" data-path="../frontend/browser.html">
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<a href="../frontend/browser.html">
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Browser integration
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</a>
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</li>
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<li class="chapter " data-level="6.3" data-path="../frontend/controllers.html">
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<a href="../frontend/controllers.html">
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Controllers
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</a>
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</li>
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<li class="header">Advanced</li>
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<li class="chapter " data-level="7.1" data-path="configuring_routers.html">
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<a href="configuring_routers.html">
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Configuring Routers
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</a>
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</li>
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<li class="chapter " data-level="7.2" data-path="composing_routers.html">
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<a href="composing_routers.html">
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Composing Routers
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</a>
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</li>
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<li class="chapter " data-level="7.3" data-path="different_routers.html">
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<a href="different_routers.html">
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Different Routers
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</a>
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</li>
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<li class="chapter " data-level="7.4" data-path="route_validation.html">
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<a href="route_validation.html">
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Route Validation
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</a>
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</li>
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<li class="chapter active" data-level="7.5" data-path="dev_workflow.html">
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<a href="dev_workflow.html">
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Dev Workflow
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</a>
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</li>
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<li class="chapter " data-level="7.6" data-path="shared_routes.html">
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<a href="shared_routes.html">
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Shared Routes
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</a>
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</li>
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<li class="header">Misc</li>
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<li class="chapter " data-level="8.1" data-path="../performance.html">
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<a href="../performance.html">
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Performance
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</a>
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</li>
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<li class="chapter " data-level="8.2" data-path="../development.html">
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<a href="../development.html">
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Development Instructions
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</a>
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</li>
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<li class="chapter " data-level="8.3" data-path="../faq.html">
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<a href="../faq.html">
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FAQ
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</a>
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</li>
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<li class="divider"></li>
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<li>
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<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
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Published with GitBook
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</a>
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</li>
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</ul>
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</nav>
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</div>
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<div class="book-body">
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<div class="body-inner">
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<div class="book-header" role="navigation">
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Dev Workflow</a>
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</h1>
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</div>
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<div class="page-wrapper" tabindex="-1" role="main">
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<section class="normal markdown-section">
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<h1 id="dev-workflow">Dev Workflow</h1>
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<p>Many applications will require the routes to span multiple namespaces. It is quite easy to do so with reitit, but we might hit a problem during development.</p>
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<h2 id="an-example">An example</h2>
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<p>Consider this sample routing :</p>
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<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> ns1)
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(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> routes
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[<span class="hljs-string">"/bar"</span> <span class="hljs-symbol">::bar</span>])
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(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> ns2)
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(<span class="hljs-name">require</span> '[ns1])
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(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> routes
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[[<span class="hljs-string">"/ping"</span> <span class="hljs-symbol">::ping</span>]
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[<span class="hljs-string">"/more"</span> ns1/routes]])
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(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> ns3)
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(<span class="hljs-name">require</span> '[ns1])
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(<span class="hljs-name">require</span> '[ns2])
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(<span class="hljs-name">require</span> '[reitit.core <span class="hljs-symbol">:as</span> r])
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(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> routes
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[<span class="hljs-string">"/api"</span>
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[<span class="hljs-string">"/ns2"</span> ns2/routes]
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[<span class="hljs-string">"/ping"</span> <span class="hljs-symbol">::ping</span>]])
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(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router (<span class="hljs-name">r/router</span> routes))
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</code></pre>
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<p>We may query the top router and get the expected result :</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">"/api/ns2/more/bar"</span>)
|
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<span class="hljs-comment">;#reitit.core.Match{:template "/api/ns2/more/bar", :data {:name :ns1/bar}, :result nil, :path-params {}, :path "/api/ns2/more/bar"}</span>
|
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</code></pre>
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<p>Notice the route name : <code>:ns1/bar</code></p>
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|
<p>When we change the routes in <code>ns1</code> like this :</p>
|
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<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> ns1
|
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(<span class="hljs-symbol">:require</span> [reitit.core <span class="hljs-symbol">:as</span> r]))
|
|
|
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(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> routes
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[<span class="hljs-string">"/bar"</span> <span class="hljs-symbol">::bar-with-new-name</span>])
|
|
</code></pre>
|
|
<p>After we recompile the <code>ns1</code> namespace, and query again</p>
|
|
<pre><code class="lang-clj">ns1/routes
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;["/bar" :ns1/bar-with-new-name]
|
|
;The routes var in ns1 was changed indeed
|
|
|
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(r/match-by-path router "/api/ns2/more/bar")
|
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;#reitit.core.Match{:template "/api/ns2/more/bar", :data {:name :ns1/bar}, :result nil, :path-params {}, :path "/api/ns2/more/bar"}
|
|
</code></pre>
|
|
<p>The route name is still <code>:ns1/bar</code> !</p>
|
|
<p>While we could use the <a href="http://thinkrelevance.com/blog/2013/06/04/clojure-workflow-reloaded" target="_blank">reloaded workflow</a> to reload the whole routing tree, it is not always possible, and quite frankly a bit slower than we might want for fast iterations.</p>
|
|
<h2 id="a-crude-solution">A crude solution</h2>
|
|
<p>In order to see the changes without reloading the whole route tree, we can use functions.</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> ns1)
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> routes [] <span class="hljs-comment">;; Now a function !</span>
|
|
[<span class="hljs-string">"/bar"</span> <span class="hljs-symbol">::bar</span>])
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> ns2)
|
|
(<span class="hljs-name">require</span> '[ns1])
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> routes [] <span class="hljs-comment">;; Now a function !</span>
|
|
[[<span class="hljs-string">"/ping"</span> <span class="hljs-symbol">::ping</span>]
|
|
[<span class="hljs-string">"/more"</span> (<span class="hljs-name">ns1/routes</span>)]]) <span class="hljs-comment">;; Now a function call</span>
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> ns3)
|
|
(<span class="hljs-name">require</span> '[ns1])
|
|
(<span class="hljs-name">require</span> '[ns2])
|
|
(<span class="hljs-name">require</span> '[reitit.core <span class="hljs-symbol">:as</span> r])
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> routes [] <span class="hljs-comment">;; Now a function !</span>
|
|
[<span class="hljs-string">"/api"</span>
|
|
[<span class="hljs-string">"/ns2"</span> (<span class="hljs-name">ns2/routes</span>)] <span class="hljs-comment">;; Now a function call</span>
|
|
[<span class="hljs-string">"/ping"</span> <span class="hljs-symbol">::ping</span>]])
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router #(<span class="hljs-name">r/router</span> (<span class="hljs-name">routes</span>))) <span class="hljs-comment">;; Now a function</span>
|
|
</code></pre>
|
|
<p>Let's query again</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> (<span class="hljs-name">router</span>) <span class="hljs-string">"/api/ns2/more/bar"</span>)
|
|
<span class="hljs-comment">;#reitit.core.Match{:template "/api/ns2/more/bar", :data {:name :ns1/bar}, :result nil, :path-params {}, :path "/api/ns2/more/bar"}</span>
|
|
</code></pre>
|
|
<p>Notice that's we're now calling a function rather than just passing <code>router</code> to the matching function.</p>
|
|
<p>Now let's again change the route name in <code>ns1</code>, and recompile that namespace.</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> ns1)
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> routes []
|
|
[<span class="hljs-string">"/bar"</span> <span class="hljs-symbol">::bar-with-new-name</span>])
|
|
</code></pre>
|
|
<p>let's see the query result :</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> (<span class="hljs-name">router</span>) <span class="hljs-string">"/api/ns2/more/bar"</span>)
|
|
<span class="hljs-comment">;#reitit.core.Match{:template "/api/ns2/more/bar", :data {:name :ns1/bar-with-new-name}, :result nil, :path-params {}, :path "/api/ns2/more/bar"}</span>
|
|
</code></pre>
|
|
<p>Notice that the name is now correct, without reloading every namespace under the sun.</p>
|
|
<h2 id="why-is-this-a-crude-solution-">Why is this a crude solution ?</h2>
|
|
<p>The astute reader will have noticed that we're recompiling the full routing tree on every invocation. While this solution is practical during development, it goes contrary to the performance goals of reitit.</p>
|
|
<p>We need a way to only do this once at production time.</p>
|
|
<h2 id="an-easy-fix">An easy fix</h2>
|
|
<p>Let's apply a small change to our <code>ns3</code>. We'll replace our router by two different routers, one for dev and one for production.</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">ns</span></span> ns3)
|
|
(<span class="hljs-name">require</span> '[ns1])
|
|
(<span class="hljs-name">require</span> '[ns2])
|
|
(<span class="hljs-name">require</span> '[reitit.core <span class="hljs-symbol">:as</span> r])
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> routes []
|
|
[<span class="hljs-string">"/api"</span>
|
|
[<span class="hljs-string">"/ns2"</span> (<span class="hljs-name">ns2/routes</span>)]
|
|
[<span class="hljs-string">"/ping"</span> <span class="hljs-symbol">::ping</span>]])
|
|
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> dev-router #(<span class="hljs-name">r/router</span> (<span class="hljs-name">routes</span>))) <span class="hljs-comment">;; A router for dev</span>
|
|
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> prod-router (<span class="hljs-name"><span class="hljs-builtin-name">constantly</span></span> (<span class="hljs-name">r/router</span> (<span class="hljs-name">routes</span>)))) <span class="hljs-comment">;; A router for prod</span>
|
|
</code></pre>
|
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<p>And there you have it, dynamic during dev, performance at production. We have it all !</p>
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