4.golang http proxy反向代理

第一种方法

后端代码:

package main

import (
    "io"
    "net/http"
)

func web1Func( w http.ResponseWriter, r* http.Request){
    io.WriteString(w,"<h1>this is test info web1</h1>")
}

func web2Func(w http.ResponseWriter, r*http.Request){
    io.WriteString(w,"<h1>this is test info web2</h1>")
}

func main(){
    http.HandleFunc("/web1",web1Func)
    http.HandleFunc("/web2",web2Func)
    http.ListenAndServe(":9001",nil)
}

前端代码:

package main

import (
    "io/ioutil"
    "log"
    "net/http"
)
type MyMux struct {

}
func (MyMux) ServeHTTP(w http.ResponseWriter,r *http.Request){
    if r.URL.Path == "/web1" {
        newRequest,_:= http.NewRequest(r.Method,"http://localhost:9001/web1",r.Body)
        req,err:=http.DefaultClient.Do(newRequest)
        if err != nil {
            log.Println("is error")
            return
        }
        data,_:= ioutil.ReadAll(req.Body)
        w.Write(data)
        return
    }
    if r.URL.Path == "/web2" {
        newRequest,_:= http.NewRequest(r.Method,"http://localhost:9001/web2",r.Body)
        req,err:=http.DefaultClient.Do(newRequest)
        if err != nil {
            log.Println("is error")
            return
        }
        data,_:= ioutil.ReadAll(req.Body)
        w.Write(data)
        return
    }


}

func main(){
    http.Handle("/",MyMux{})
    http.ListenAndServe(":7001",nil)
}

思考：第一种方法虽然可行，但是header头里面的信息传递不到后面去，如果需要传递的话，还必须加工http的header头

第二种方法

 后端代码:

package main

import (
    "io"
    "net/http"
)

func web1Func( w http.ResponseWriter, r* http.Request){
    io.WriteString(w,"<h1>this is test info web1</h1>")
}

func web2Func(w http.ResponseWriter, r*http.Request){
    io.WriteString(w,"<h1>this is test info web2</h1>")
}

func web3Func(w http.ResponseWriter, r*http.Request){
    io.WriteString(w,"<h1>this is test info web3</h1>")
}
func main(){
    http.HandleFunc("/web1",web1Func)
    http.HandleFunc("/web2",web2Func)
    http.HandleFunc("/web3",web3Func)
    http.ListenAndServe(":9001",nil)
}

 前端代码

package main

import (
    "net/http"
    "net/http/httputil"
    "net/url"
)
type MyMux struct {

}
//简单反向代理代码最少，heaer也传递过去了
func (MyMux) ServeHTTP(w http.ResponseWriter,r *http.Request){
    sendurl:="http://localhost:9001"
    target,_:=url.Parse(sendurl)
    proxy:=httputil.NewSingleHostReverseProxy(target)
    proxy.ServeHTTP(w,r)
}

func main(){
    http.Handle("/",MyMux{})
    http.ListenAndServe(":7001",nil)
}