有没有可能让net.http.ServeMux匹配整个子树？

Question

我想创建一个ServeMux来匹配整个子树。

例如：

有一个处理程序能够处理所有与用户相关的函数。列出所有可能的与用户相关的urls并不好，比如

mux := http.NewServeMux()  
mux.Handle("/user/", TestHandler)
mux.Handle("/user/function01", TestHandler)
mux.Handle("/user/function02", TestHandler)
mux.Handle("/user/function03/sub-function01", TestHandler)
...
...
mux.Handle("/user/function100/sub-function01", TestHandler)
mux.Handle("/user/function100/sub-function01/sub-sub-function01", TestHandler)

是否可以在一行中匹配所有以“/user”开头的urls？

Answer 1

对于example，如果路径不存在，它将自动调用/user/处理程序

func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/user/", func(w http.ResponseWriter, req *http.Request) {
        fmt.Fprintf(w, "generic user handler: %v\n", req.URL.Path)
    })
    mux.HandleFunc("/user/f1/", func(w http.ResponseWriter, req *http.Request) {
        fmt.Fprintf(w, "f1 generic handler, %v\n", req.URL.Path)
    })
    mux.HandleFunc("/user/f1/sf1", func(w http.ResponseWriter, req *http.Request) {
        fmt.Fprintf(w, "sf1 generic handler, %v\n", req.URL.Path)
    })
    fmt.Println(http.ListenAndServe(":9020", mux))
}

产生：

➜ curl localhost:9020/user/
generic user handler: /user/
➜ curl localhost:9020/user/f1/
f1 generic handler, /user/f1/
➜ curl localhost:9020/user/f1/sf1
sf1 generic handler, /user/f1/sf1
➜ curl localhost:9020/user/f2
generic user handler: /user/f2
➜ curl localhost:9020/user/f1/sf2
f1 generic handler, /user/f1/sf2