package main                import (            "fmt"            "io"            "net/http"        )                func main() {            http.HandleFunc("/", route)            e := http.ListenAndServe(":80", nil)            if e != nil {                fmt.Println(e)            }        }                func route(w http.ResponseWriter, r *http.Request) {            req, _ := http.NewRequest(r.Method, "", r.Body)            req.URL = r.URL            req.URL.Host = r.Host //"www.qq.com"            req.URL.Scheme = "http"            for _, v := range r.Cookies() {                req.AddCookie(v)            }            //req.Header = r.Header 这里的Header就不要使用了,使用的话他会自动跳转到https,代理就出问题了.            resp, err := http.DefaultClient.Do(req)            if err != nil {                fmt.Println("Here:", err)                return            }            for k, v := range resp.Header {                for _, value := range v {                    w.Header().Add(k, value)                }            }            for _, cookie := range resp.Cookies() {                w.Header().Add("Set-Cookie", cookie.Raw)            }            w.WriteHeader(resp.StatusCode)            io.Copy(w, resp.Body)            resp.Body.Close()            r.Body.Close()        }