wechat_hitxy/main.go

package main

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

func main() {
	http.HandleFunc("/", webrootHandler)
	http.HandleFunc("/api", apiV1Main)
	//http.ListenAndServe("127.0.0.1:65500", nil)
	http.ListenAndServe(":65500", nil)
}

//apiV1Main  version 1 main entry for all wechat callbacks
//
func apiV1Main(w http.ResponseWriter, r *http.Request) {
	logRequestDebug(httputil.DumpRequest(r, true))
	rq := r.URL.RawQuery
	m, _ := url.ParseQuery(rq)
	fmt.Fprintf(w, m["echostr"][0])
}

//webrootHandler sending contents to client when request "/"
//      essentially to prove the webserver is still alive
//      echo query string to the client
func webrootHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
	rq := r.URL.RawQuery
	m, _ := url.ParseQuery(rq)
	for index, element := range m {
		fmt.Fprintf(w, "\r\n%s => %s", index, element)
	}
	logRequestDebug(httputil.DumpRequest(r, true))

}

func logRequestDebug(data []byte, err error) {
	if err == nil {
		fmt.Printf("%s\n\n", data)
	} else {
		log.Fatalf("%s\n\n", err)
	}
}