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* When route cannot be found on chi, go to macaron * Stick chi version to 1.5.0 * Follow router log setting
496 lines
22 KiB
Markdown
Vendored
496 lines
22 KiB
Markdown
Vendored
# <img alt="chi" src="https://cdn.rawgit.com/go-chi/chi/master/_examples/chi.svg" width="220" />
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[![GoDoc Widget]][GoDoc] [![Travis Widget]][Travis]
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`chi` is a lightweight, idiomatic and composable router for building Go HTTP services. It's
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especially good at helping you write large REST API services that are kept maintainable as your
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project grows and changes. `chi` is built on the new `context` package introduced in Go 1.7 to
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handle signaling, cancelation and request-scoped values across a handler chain.
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The focus of the project has been to seek out an elegant and comfortable design for writing
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REST API servers, written during the development of the Pressly API service that powers our
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public API service, which in turn powers all of our client-side applications.
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The key considerations of chi's design are: project structure, maintainability, standard http
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handlers (stdlib-only), developer productivity, and deconstructing a large system into many small
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parts. The core router `github.com/go-chi/chi` is quite small (less than 1000 LOC), but we've also
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included some useful/optional subpackages: [middleware](/middleware), [render](https://github.com/go-chi/render) and [docgen](https://github.com/go-chi/docgen). We hope you enjoy it too!
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## Install
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`go get -u github.com/go-chi/chi`
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## Features
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* **Lightweight** - cloc'd in ~1000 LOC for the chi router
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* **Fast** - yes, see [benchmarks](#benchmarks)
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* **100% compatible with net/http** - use any http or middleware pkg in the ecosystem that is also compatible with `net/http`
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* **Designed for modular/composable APIs** - middlewares, inline middlewares, route groups and subrouter mounting
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* **Context control** - built on new `context` package, providing value chaining, cancellations and timeouts
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* **Robust** - in production at Pressly, CloudFlare, Heroku, 99Designs, and many others (see [discussion](https://github.com/go-chi/chi/issues/91))
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* **Doc generation** - `docgen` auto-generates routing documentation from your source to JSON or Markdown
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* **No external dependencies** - plain ol' Go stdlib + net/http
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## Examples
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See [_examples/](https://github.com/go-chi/chi/blob/master/_examples/) for a variety of examples.
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**As easy as:**
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```go
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package main
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import (
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"net/http"
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"github.com/go-chi/chi"
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"github.com/go-chi/chi/middleware"
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)
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func main() {
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r := chi.NewRouter()
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r.Use(middleware.Logger)
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r.Get("/", func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte("welcome"))
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})
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http.ListenAndServe(":3000", r)
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}
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```
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**REST Preview:**
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Here is a little preview of how routing looks like with chi. Also take a look at the generated routing docs
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in JSON ([routes.json](https://github.com/go-chi/chi/blob/master/_examples/rest/routes.json)) and in
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Markdown ([routes.md](https://github.com/go-chi/chi/blob/master/_examples/rest/routes.md)).
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I highly recommend reading the source of the [examples](https://github.com/go-chi/chi/blob/master/_examples/) listed
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above, they will show you all the features of chi and serve as a good form of documentation.
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```go
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import (
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//...
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"context"
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"github.com/go-chi/chi"
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"github.com/go-chi/chi/middleware"
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)
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func main() {
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r := chi.NewRouter()
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// A good base middleware stack
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r.Use(middleware.RequestID)
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r.Use(middleware.RealIP)
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r.Use(middleware.Logger)
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r.Use(middleware.Recoverer)
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// Set a timeout value on the request context (ctx), that will signal
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// through ctx.Done() that the request has timed out and further
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// processing should be stopped.
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r.Use(middleware.Timeout(60 * time.Second))
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r.Get("/", func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte("hi"))
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})
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// RESTy routes for "articles" resource
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r.Route("/articles", func(r chi.Router) {
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r.With(paginate).Get("/", listArticles) // GET /articles
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r.With(paginate).Get("/{month}-{day}-{year}", listArticlesByDate) // GET /articles/01-16-2017
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r.Post("/", createArticle) // POST /articles
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r.Get("/search", searchArticles) // GET /articles/search
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// Regexp url parameters:
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r.Get("/{articleSlug:[a-z-]+}", getArticleBySlug) // GET /articles/home-is-toronto
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// Subrouters:
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r.Route("/{articleID}", func(r chi.Router) {
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r.Use(ArticleCtx)
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r.Get("/", getArticle) // GET /articles/123
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r.Put("/", updateArticle) // PUT /articles/123
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r.Delete("/", deleteArticle) // DELETE /articles/123
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})
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})
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// Mount the admin sub-router
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r.Mount("/admin", adminRouter())
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http.ListenAndServe(":3333", r)
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}
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func ArticleCtx(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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articleID := chi.URLParam(r, "articleID")
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article, err := dbGetArticle(articleID)
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if err != nil {
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http.Error(w, http.StatusText(404), 404)
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return
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}
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ctx := context.WithValue(r.Context(), "article", article)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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func getArticle(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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article, ok := ctx.Value("article").(*Article)
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if !ok {
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http.Error(w, http.StatusText(422), 422)
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return
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}
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w.Write([]byte(fmt.Sprintf("title:%s", article.Title)))
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}
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// A completely separate router for administrator routes
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func adminRouter() http.Handler {
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r := chi.NewRouter()
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r.Use(AdminOnly)
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r.Get("/", adminIndex)
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r.Get("/accounts", adminListAccounts)
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return r
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}
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func AdminOnly(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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perm, ok := ctx.Value("acl.permission").(YourPermissionType)
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if !ok || !perm.IsAdmin() {
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http.Error(w, http.StatusText(403), 403)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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```
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## Router interface
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chi's router is based on a kind of [Patricia Radix trie](https://en.wikipedia.org/wiki/Radix_tree).
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The router is fully compatible with `net/http`.
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Built on top of the tree is the `Router` interface:
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```go
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// Router consisting of the core routing methods used by chi's Mux,
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// using only the standard net/http.
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type Router interface {
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http.Handler
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Routes
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// Use appends one or more middlewares onto the Router stack.
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Use(middlewares ...func(http.Handler) http.Handler)
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// With adds inline middlewares for an endpoint handler.
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With(middlewares ...func(http.Handler) http.Handler) Router
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// Group adds a new inline-Router along the current routing
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// path, with a fresh middleware stack for the inline-Router.
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Group(fn func(r Router)) Router
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// Route mounts a sub-Router along a `pattern`` string.
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Route(pattern string, fn func(r Router)) Router
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// Mount attaches another http.Handler along ./pattern/*
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Mount(pattern string, h http.Handler)
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// Handle and HandleFunc adds routes for `pattern` that matches
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// all HTTP methods.
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Handle(pattern string, h http.Handler)
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HandleFunc(pattern string, h http.HandlerFunc)
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// Method and MethodFunc adds routes for `pattern` that matches
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// the `method` HTTP method.
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Method(method, pattern string, h http.Handler)
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MethodFunc(method, pattern string, h http.HandlerFunc)
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// HTTP-method routing along `pattern`
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Connect(pattern string, h http.HandlerFunc)
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Delete(pattern string, h http.HandlerFunc)
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Get(pattern string, h http.HandlerFunc)
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Head(pattern string, h http.HandlerFunc)
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Options(pattern string, h http.HandlerFunc)
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Patch(pattern string, h http.HandlerFunc)
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Post(pattern string, h http.HandlerFunc)
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Put(pattern string, h http.HandlerFunc)
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Trace(pattern string, h http.HandlerFunc)
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// NotFound defines a handler to respond whenever a route could
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// not be found.
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NotFound(h http.HandlerFunc)
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// MethodNotAllowed defines a handler to respond whenever a method is
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// not allowed.
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MethodNotAllowed(h http.HandlerFunc)
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}
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// Routes interface adds two methods for router traversal, which is also
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// used by the github.com/go-chi/docgen package to generate documentation for Routers.
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type Routes interface {
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// Routes returns the routing tree in an easily traversable structure.
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Routes() []Route
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// Middlewares returns the list of middlewares in use by the router.
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Middlewares() Middlewares
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// Match searches the routing tree for a handler that matches
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// the method/path - similar to routing a http request, but without
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// executing the handler thereafter.
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Match(rctx *Context, method, path string) bool
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}
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```
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Each routing method accepts a URL `pattern` and chain of `handlers`. The URL pattern
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supports named params (ie. `/users/{userID}`) and wildcards (ie. `/admin/*`). URL parameters
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can be fetched at runtime by calling `chi.URLParam(r, "userID")` for named parameters
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and `chi.URLParam(r, "*")` for a wildcard parameter.
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### Middleware handlers
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chi's middlewares are just stdlib net/http middleware handlers. There is nothing special
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about them, which means the router and all the tooling is designed to be compatible and
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friendly with any middleware in the community. This offers much better extensibility and reuse
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of packages and is at the heart of chi's purpose.
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Here is an example of a standard net/http middleware where we assign a context key `"user"`
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the value of `"123"`. This middleware sets a hypothetical user identifier on the request
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context and calls the next handler in the chain.
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```go
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// HTTP middleware setting a value on the request context
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func MyMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// create new context from `r` request context, and assign key `"user"`
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// to value of `"123"`
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ctx := context.WithValue(r.Context(), "user", "123")
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// call the next handler in the chain, passing the response writer and
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// the updated request object with the new context value.
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//
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// note: context.Context values are nested, so any previously set
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// values will be accessible as well, and the new `"user"` key
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// will be accessible from this point forward.
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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```
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### Request handlers
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chi uses standard net/http request handlers. This little snippet is an example of a http.Handler
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func that reads a user identifier from the request context - hypothetically, identifying
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the user sending an authenticated request, validated+set by a previous middleware handler.
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```go
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// HTTP handler accessing data from the request context.
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func MyRequestHandler(w http.ResponseWriter, r *http.Request) {
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// here we read from the request context and fetch out `"user"` key set in
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// the MyMiddleware example above.
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user := r.Context().Value("user").(string)
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// respond to the client
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w.Write([]byte(fmt.Sprintf("hi %s", user)))
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}
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```
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### URL parameters
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chi's router parses and stores URL parameters right onto the request context. Here is
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an example of how to access URL params in your net/http handlers. And of course, middlewares
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are able to access the same information.
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```go
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// HTTP handler accessing the url routing parameters.
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func MyRequestHandler(w http.ResponseWriter, r *http.Request) {
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// fetch the url parameter `"userID"` from the request of a matching
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// routing pattern. An example routing pattern could be: /users/{userID}
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userID := chi.URLParam(r, "userID")
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// fetch `"key"` from the request context
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ctx := r.Context()
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key := ctx.Value("key").(string)
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// respond to the client
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w.Write([]byte(fmt.Sprintf("hi %v, %v", userID, key)))
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}
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```
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## Middlewares
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chi comes equipped with an optional `middleware` package, providing a suite of standard
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`net/http` middlewares. Please note, any middleware in the ecosystem that is also compatible
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with `net/http` can be used with chi's mux.
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### Core middlewares
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----------------------------------------------------------------------------------------------------
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| chi/middleware Handler | description |
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| :--------------------- | :---------------------------------------------------------------------- |
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| [AllowContentType] | Explicit whitelist of accepted request Content-Types |
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| [BasicAuth] | Basic HTTP authentication |
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| [Compress] | Gzip compression for clients that accept compressed responses |
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| [GetHead] | Automatically route undefined HEAD requests to GET handlers |
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| [Heartbeat] | Monitoring endpoint to check the servers pulse |
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| [Logger] | Logs the start and end of each request with the elapsed processing time |
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| [NoCache] | Sets response headers to prevent clients from caching |
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| [Profiler] | Easily attach net/http/pprof to your routers |
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| [RealIP] | Sets a http.Request's RemoteAddr to either X-Forwarded-For or X-Real-IP |
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| [Recoverer] | Gracefully absorb panics and prints the stack trace |
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| [RequestID] | Injects a request ID into the context of each request |
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| [RedirectSlashes] | Redirect slashes on routing paths |
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| [SetHeader] | Short-hand middleware to set a response header key/value |
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| [StripSlashes] | Strip slashes on routing paths |
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| [Throttle] | Puts a ceiling on the number of concurrent requests |
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| [Timeout] | Signals to the request context when the timeout deadline is reached |
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| [URLFormat] | Parse extension from url and put it on request context |
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| [WithValue] | Short-hand middleware to set a key/value on the request context |
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----------------------------------------------------------------------------------------------------
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[AllowContentEncoding]: https://pkg.go.dev/github.com/go-chi/chi/middleware#AllowContentEncoding
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[AllowContentType]: https://pkg.go.dev/github.com/go-chi/chi/middleware#AllowContentType
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[BasicAuth]: https://pkg.go.dev/github.com/go-chi/chi/middleware#BasicAuth
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[Compress]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Compress
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[ContentCharset]: https://pkg.go.dev/github.com/go-chi/chi/middleware#ContentCharset
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[GetHead]: https://pkg.go.dev/github.com/go-chi/chi/middleware#GetHead
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[GetReqID]: https://pkg.go.dev/github.com/go-chi/chi/middleware#GetReqID
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[Heartbeat]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Heartbeat
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[Logger]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Logger
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[New]: https://pkg.go.dev/github.com/go-chi/chi/middleware#New
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[NextRequestID]: https://pkg.go.dev/github.com/go-chi/chi/middleware#NextRequestID
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[NoCache]: https://pkg.go.dev/github.com/go-chi/chi/middleware#NoCache
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[PrintPrettyStack]: https://pkg.go.dev/github.com/go-chi/chi/middleware#PrintPrettyStack
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[Profiler]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Profiler
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[RealIP]: https://pkg.go.dev/github.com/go-chi/chi/middleware#RealIP
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[Recoverer]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Recoverer
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[RedirectSlashes]: https://pkg.go.dev/github.com/go-chi/chi/middleware#RedirectSlashes
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[RequestID]: https://pkg.go.dev/github.com/go-chi/chi/middleware#RequestID
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[RequestLogger]: https://pkg.go.dev/github.com/go-chi/chi/middleware#RequestLogger
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[SetHeader]: https://pkg.go.dev/github.com/go-chi/chi/middleware#SetHeader
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[StripSlashes]: https://pkg.go.dev/github.com/go-chi/chi/middleware#StripSlashes
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[Throttle]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Throttle
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[ThrottleBacklog]: https://pkg.go.dev/github.com/go-chi/chi/middleware#ThrottleBacklog
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[ThrottleWithOpts]: https://pkg.go.dev/github.com/go-chi/chi/middleware#ThrottleWithOpts
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[Timeout]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Timeout
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[URLFormat]: https://pkg.go.dev/github.com/go-chi/chi/middleware#URLFormat
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[WithLogEntry]: https://pkg.go.dev/github.com/go-chi/chi/middleware#WithLogEntry
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[WithValue]: https://pkg.go.dev/github.com/go-chi/chi/middleware#WithValue
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[Compressor]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Compressor
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[DefaultLogFormatter]: https://pkg.go.dev/github.com/go-chi/chi/middleware#DefaultLogFormatter
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[EncoderFunc]: https://pkg.go.dev/github.com/go-chi/chi/middleware#EncoderFunc
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[HeaderRoute]: https://pkg.go.dev/github.com/go-chi/chi/middleware#HeaderRoute
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[HeaderRouter]: https://pkg.go.dev/github.com/go-chi/chi/middleware#HeaderRouter
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[LogEntry]: https://pkg.go.dev/github.com/go-chi/chi/middleware#LogEntry
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[LogFormatter]: https://pkg.go.dev/github.com/go-chi/chi/middleware#LogFormatter
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[LoggerInterface]: https://pkg.go.dev/github.com/go-chi/chi/middleware#LoggerInterface
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[Pattern]: https://pkg.go.dev/github.com/go-chi/chi/middleware#Pattern
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[ThrottleOpts]: https://pkg.go.dev/github.com/go-chi/chi/middleware#ThrottleOpts
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[WrapResponseWriter]: https://pkg.go.dev/github.com/go-chi/chi/middleware#WrapResponseWriter
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### Extra middlewares & packages
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Please see https://github.com/go-chi for additional packages.
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--------------------------------------------------------------------------------------------------------------------
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| package | description |
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|:---------------------------------------------------|:-------------------------------------------------------------
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| [cors](https://github.com/go-chi/cors) | Cross-origin resource sharing (CORS) |
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| [docgen](https://github.com/go-chi/docgen) | Print chi.Router routes at runtime |
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| [jwtauth](https://github.com/go-chi/jwtauth) | JWT authentication |
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| [hostrouter](https://github.com/go-chi/hostrouter) | Domain/host based request routing |
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| [httplog](https://github.com/go-chi/httplog) | Small but powerful structured HTTP request logging |
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| [httprate](https://github.com/go-chi/httprate) | HTTP request rate limiter |
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| [httptracer](https://github.com/go-chi/httptracer) | HTTP request performance tracing library |
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| [httpvcr](https://github.com/go-chi/httpvcr) | Write deterministic tests for external sources |
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| [stampede](https://github.com/go-chi/stampede) | HTTP request coalescer |
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--------------------------------------------------------------------------------------------------------------------
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## context?
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`context` is a tiny pkg that provides simple interface to signal context across call stacks
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and goroutines. It was originally written by [Sameer Ajmani](https://github.com/Sajmani)
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and is available in stdlib since go1.7.
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Learn more at https://blog.golang.org/context
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and..
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* Docs: https://golang.org/pkg/context
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* Source: https://github.com/golang/go/tree/master/src/context
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## Benchmarks
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The benchmark suite: https://github.com/pkieltyka/go-http-routing-benchmark
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Results as of Jan 9, 2019 with Go 1.11.4 on Linux X1 Carbon laptop
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```shell
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BenchmarkChi_Param 3000000 475 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_Param5 2000000 696 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_Param20 1000000 1275 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_ParamWrite 3000000 505 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_GithubStatic 3000000 508 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_GithubParam 2000000 669 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_GithubAll 10000 134627 ns/op 87699 B/op 609 allocs/op
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BenchmarkChi_GPlusStatic 3000000 402 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_GPlusParam 3000000 500 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_GPlus2Params 3000000 586 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_GPlusAll 200000 7237 ns/op 5616 B/op 39 allocs/op
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BenchmarkChi_ParseStatic 3000000 408 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_ParseParam 3000000 488 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_Parse2Params 3000000 551 ns/op 432 B/op 3 allocs/op
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BenchmarkChi_ParseAll 100000 13508 ns/op 11232 B/op 78 allocs/op
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BenchmarkChi_StaticAll 20000 81933 ns/op 67826 B/op 471 allocs/op
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|
```
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Comparison with other routers: https://gist.github.com/pkieltyka/123032f12052520aaccab752bd3e78cc
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NOTE: the allocs in the benchmark above are from the calls to http.Request's
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|
`WithContext(context.Context)` method that clones the http.Request, sets the `Context()`
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|
on the duplicated (alloc'd) request and returns it the new request object. This is just
|
|
how setting context on a request in Go works.
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## Credits
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|
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* Carl Jackson for https://github.com/zenazn/goji
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* Parts of chi's thinking comes from goji, and chi's middleware package
|
|
sources from goji.
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|
* Armon Dadgar for https://github.com/armon/go-radix
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|
* Contributions: [@VojtechVitek](https://github.com/VojtechVitek)
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We'll be more than happy to see [your contributions](./CONTRIBUTING.md)!
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|
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## Beyond REST
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|
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chi is just a http router that lets you decompose request handling into many smaller layers.
|
|
Many companies use chi to write REST services for their public APIs. But, REST is just a convention
|
|
for managing state via HTTP, and there's a lot of other pieces required to write a complete client-server
|
|
system or network of microservices.
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|
|
|
Looking beyond REST, I also recommend some newer works in the field:
|
|
* [webrpc](https://github.com/webrpc/webrpc) - Web-focused RPC client+server framework with code-gen
|
|
* [gRPC](https://github.com/grpc/grpc-go) - Google's RPC framework via protobufs
|
|
* [graphql](https://github.com/99designs/gqlgen) - Declarative query language
|
|
* [NATS](https://nats.io) - lightweight pub-sub
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## License
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Copyright (c) 2015-present [Peter Kieltyka](https://github.com/pkieltyka)
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Licensed under [MIT License](./LICENSE)
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[GoDoc]: https://pkg.go.dev/github.com/go-chi/chi?tab=versions
|
|
[GoDoc Widget]: https://godoc.org/github.com/go-chi/chi?status.svg
|
|
[Travis]: https://travis-ci.org/go-chi/chi
|
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[Travis Widget]: https://travis-ci.org/go-chi/chi.svg?branch=master
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