是否可能知道HandleFunc中使用的路由

Question

I am using net/http http.HandleFunc("/resource", resource.Handle) and I was wondering if there was a way to see what route (in this case /resource) is used to get you to resource.Handle? Or do I have to create a Mux for this?

I'd like to know this to extract the resource from the url path to do some magic with it...

Answer 1

Yes you can

The main points to do:

• Use the DefaultServeMux used by the HandleFunc method.
• Construct a fake http.Request

For Example:

package main

import (
    "fmt"
    "net/http"
    "net/url"
)

func main() {

    theUrl, err := url.Parse("/response")
    if err != nil {
        fmt.Println(err.Error())
        return
    }
    http.HandleFunc("/response", func(w http.ResponseWriter, r *http.Request) {

    })

    handler, path := http.DefaultServeMux.Handler(&http.Request{Method: "GET", URL: theUrl})

    fmt.Println(handler, path)

}

see this Go Playground