Golang http代理
package main import ( "fmt" "io" "net" "net/http" "strings" ) type Pxy struct{} func (p *Pxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) { fmt.Printf("Received request %s %s %s\n", req.Method, req.Host, req.RemoteAddr) fmt.Println(req.RequestURI) transport := http.DefaultTransport // step 1，浅拷贝对象，然后就再新增属性数据 outReq := new(http.Request) *outReq = *req if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil { if prior, ok := outReq.Header["X-Forwarded-For"]; ok { clientIP = strings.Join(prior, ", ") + ", " + clientIP } outReq.Header.Set("X-Forwarded-For", clientIP) } // step 2, 请求下游 res, err := transport.RoundTrip(outReq) if err != nil { rw.WriteHeader(http.StatusBadGateway) return } // step 3, 把下游请求内容返回给上游 for key, value := range res.Header { for _, v := range value { rw.Header().Add(key, v) } } rw.Header().Set("aaaaaaaaaa","aaaaaaa") rw.WriteHeader(res.StatusCode) io.Copy(rw, res.Body) res.Body.Close() } func main() { fmt.Println("Serve on :8080") http.Handle("/", &Pxy{}) http.ListenAndServe("0.0.0.0:8080", nil) }测试的话在浏览器或系统设置设置一下就可以看到