go - 通过代理重新发送请求时，无法在客户端请求中设置“Request.RequestURI”错误

Question

当我尝试重新发送请求时，通过简单的proxy(代理代码)重新发送请求

http.HandleFunc("/",func(w http.ResponseWriter, r *http.Request) {
    log.Printf("proxy rq: %v", r)
    client := &http.Client{}
    proxyRes, err := client.Do(r) // 👈🏻  Get "http://localhost:8097/tmp": http: Request.RequestURI can't be set in client requests
    if err != nil {
        log.Fatalf("err proxy request: %v",err)
    }
    resBody := proxyRes.Body
    defer resBody.Close()
    if _, err := io.Copy(w, resBody); err != nil {
        log.Printf("copy error:%v\n", err)
    }
})
http.ListenAndServe(":8099", nil)

与设置 http_proxy ENV(我需要捕获所有http流量)

% export http_proxy=http://localhost:8099 
% curl -v http://localhost:8097/tmp

我得到像 error

Get "http://localhost:8097/tmp": http: Request.RequestURI can't be set in client requests

我错过了什么

Answer 1

您不能将客户端请求用作Do的参数。使用与r相同的参数创建一个新请求，然后对此请求执行Do