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-mux
-===
-[![GoDoc](https://godoc.org/github.com/gorilla/mux?status.svg)](https://godoc.org/github.com/gorilla/mux)
-[![Build Status](https://travis-ci.org/gorilla/mux.svg?branch=master)](https://travis-ci.org/gorilla/mux)
-
-Package `gorilla/mux` implements a request router and dispatcher.
-
-The name mux stands for "HTTP request multiplexer". Like the standard `http.ServeMux`, `mux.Router` matches incoming requests against a list of registered routes and calls a handler for the route that matches the URL or other conditions. The main features are:
-
-* Requests can be matched based on URL host, path, path prefix, schemes, header and query values, HTTP methods or using custom matchers.
-* URL hosts and paths can have variables with an optional regular expression.
-* Registered URLs can be built, or "reversed", which helps maintaining references to resources.
-* Routes can be used as subrouters: nested routes are only tested if the parent route matches. This is useful to define groups of routes that share common conditions like a host, a path prefix or other repeated attributes. As a bonus, this optimizes request matching.
-* It implements the `http.Handler` interface so it is compatible with the standard `http.ServeMux`.
-
-Let's start registering a couple of URL paths and handlers:
-
-```go
-func main() {
-        r := mux.NewRouter()
-        r.HandleFunc("/", HomeHandler)
-        r.HandleFunc("/products", ProductsHandler)
-        r.HandleFunc("/articles", ArticlesHandler)
-        http.Handle("/", r)
-}
-```
-
-Here we register three routes mapping URL paths to handlers. This is equivalent to how `http.HandleFunc()` works: if an incoming request URL matches one of the paths, the corresponding handler is called passing (`http.ResponseWriter`, `*http.Request`) as parameters.
-
-Paths can have variables. They are defined using the format `{name}` or `{name:pattern}`. If a regular expression pattern is not defined, the matched variable will be anything until the next slash. For example:
-
-```go
-r := mux.NewRouter()
-r.HandleFunc("/products/{key}", ProductHandler)
-r.HandleFunc("/articles/{category}/", ArticlesCategoryHandler)
-r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler)
-```
-
-The names are used to create a map of route variables which can be retrieved calling `mux.Vars()`:
-
-```go
-vars := mux.Vars(request)
-category := vars["category"]
-```
-
-And this is all you need to know about the basic usage. More advanced options are explained below.
-
-Routes can also be restricted to a domain or subdomain. Just define a host pattern to be matched. They can also have variables:
-
-```go
-r := mux.NewRouter()
-// Only matches if domain is "www.example.com".
-r.Host("www.example.com")
-// Matches a dynamic subdomain.
-r.Host("{subdomain:[a-z]+}.domain.com")
-```
-
-There are several other matchers that can be added. To match path prefixes:
-
-```go
-r.PathPrefix("/products/")
-```
-
-...or HTTP methods:
-
-```go
-r.Methods("GET", "POST")
-```
-
-...or URL schemes:
-
-```go
-r.Schemes("https")
-```
-
-...or header values:
-
-```go
-r.Headers("X-Requested-With", "XMLHttpRequest")
-```
-
-...or query values:
-
-```go
-r.Queries("key", "value")
-```
-
-...or to use a custom matcher function:
-
-```go
-r.MatcherFunc(func(r *http.Request, rm *RouteMatch) bool {
-        return r.ProtoMajor == 0
-})
-```
-
-...and finally, it is possible to combine several matchers in a single route:
-
-```go
-r.HandleFunc("/products", ProductsHandler).
-  Host("www.example.com").
-  Methods("GET").
-  Schemes("http")
-```
-
-Setting the same matching conditions again and again can be boring, so we have a way to group several routes that share the same requirements. We call it "subrouting".
-
-For example, let's say we have several URLs that should only match when the host is `www.example.com`. Create a route for that host and get a "subrouter" from it:
-
-```go
-r := mux.NewRouter()
-s := r.Host("www.example.com").Subrouter()
-```
-
-Then register routes in the subrouter:
-
-```go
-s.HandleFunc("/products/", ProductsHandler)
-s.HandleFunc("/products/{key}", ProductHandler)
-s.HandleFunc("/articles/{category}/{id:[0-9]+}"), ArticleHandler)
-```
-
-The three URL paths we registered above will only be tested if the domain is `www.example.com`, because the subrouter is tested first. This is not only convenient, but also optimizes request matching. You can create subrouters combining any attribute matchers accepted by a route.
-
-Subrouters can be used to create domain or path "namespaces": you define subrouters in a central place and then parts of the app can register its paths relatively to a given subrouter.
-
-There's one more thing about subroutes. When a subrouter has a path prefix, the inner routes use it as base for their paths:
-
-```go
-r := mux.NewRouter()
-s := r.PathPrefix("/products").Subrouter()
-// "/products/"
-s.HandleFunc("/", ProductsHandler)
-// "/products/{key}/"
-s.HandleFunc("/{key}/", ProductHandler)
-// "/products/{key}/details"
-s.HandleFunc("/{key}/details", ProductDetailsHandler)
-```
-
-Now let's see how to build registered URLs.
-
-Routes can be named. All routes that define a name can have their URLs built, or "reversed". We define a name calling `Name()` on a route. For example:
-
-```go
-r := mux.NewRouter()
-r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
-  Name("article")
-```
-
-To build a URL, get the route and call the `URL()` method, passing a sequence of key/value pairs for the route variables. For the previous route, we would do:
-
-```go
-url, err := r.Get("article").URL("category", "technology", "id", "42")
-```
-
-...and the result will be a `url.URL` with the following path:
-
-```
-"/articles/technology/42"
-```
-
-This also works for host variables:
-
-```go
-r := mux.NewRouter()
-r.Host("{subdomain}.domain.com").
-  Path("/articles/{category}/{id:[0-9]+}").
-  HandlerFunc(ArticleHandler).
-  Name("article")
-
-// url.String() will be "http://news.domain.com/articles/technology/42"
-url, err := r.Get("article").URL("subdomain", "news",
-                                 "category", "technology",
-                                 "id", "42")
-```
-
-All variables defined in the route are required, and their values must conform to the corresponding patterns. These requirements guarantee that a generated URL will always match a registered route -- the only exception is for explicitly defined "build-only" routes which never match.
-
-Regex support also exists for matching Headers within a route. For example, we could do:
-
-```go
-r.HeadersRegexp("Content-Type", "application/(text|json)")
-```
-
-...and the route will match both requests with a Content-Type of `application/json` as well as `application/text`
-
-There's also a way to build only the URL host or path for a route: use the methods `URLHost()` or `URLPath()` instead. For the previous route, we would do:
-
-```go
-// "http://news.domain.com/"
-host, err := r.Get("article").URLHost("subdomain", "news")
-
-// "/articles/technology/42"
-path, err := r.Get("article").URLPath("category", "technology", "id", "42")
-```
-
-And if you use subrouters, host and path defined separately can be built as well:
-
-```go
-r := mux.NewRouter()
-s := r.Host("{subdomain}.domain.com").Subrouter()
-s.Path("/articles/{category}/{id:[0-9]+}").
-  HandlerFunc(ArticleHandler).
-  Name("article")
-
-// "http://news.domain.com/articles/technology/42"
-url, err := r.Get("article").URL("subdomain", "news",
-                                 "category", "technology",
-                                 "id", "42")
-```
-
-## Full Example
-
-Here's a complete, runnable example of a small `mux` based server:
-
-```go
-package main
-
-import (
-        "net/http"
-
-        "github.com/gorilla/mux"
-)
-
-func YourHandler(w http.ResponseWriter, r *http.Request) {
-        w.Write([]byte("Gorilla!\n"))
-}
-
-func main() {
-        r := mux.NewRouter()
-        // Routes consist of a path and a handler function.
-        r.HandleFunc("/", YourHandler)
-
-        // Bind to a port and pass our router in
-        http.ListenAndServe(":8000", r)
-}
-```
-
-## License
-
-BSD licensed. See the LICENSE file for details.