gorilla/mux 请求路由和分发的 Go 框架

gorilla/mux 实现了一个请求路由和分发的 Go 框架。mux 名字的意思是 "HTTP request multiplexer". 和标准包 http.ServeMux类似，  mux.Router根据已注册路由列表匹配传入请求，并调用与URL或其他条件匹配的路由的处理程序。主要特性：It implements the http.Handler interface so it is compatible with the standard http.ServeMux. Requests can be matched based on URL host, path, path prefix, schemes, header and query values, HTTP methods or using custom matchers. URL hosts, paths and query values 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.安装go get -u github.com/gorilla/mux代码示例func main() {
r := mux.NewRouter()
r.HandleFunc("/", HomeHandler)
r.HandleFunc("/products", ProductsHandler)
r.HandleFunc("/articles", ArticlesHandler)
http.Handle("/", r)
}这里我们注册了三个 URL 匹配路由进行处理。路径也可以是变量：r := mux.NewRouter()
r.HandleFunc("/products/{key}", ProductHandler)
r.HandleFunc("/articles/{category}/", ArticlesCategoryHandler)
r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler)这些名称用于创建路由变量的映射，可以通过调用mux.Vars 获取：func ArticlesCategoryHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "Category: %v\n", vars["category"])
}