3min快速掌握Go语言正/反向代理的姿势 - 博客猿马甲哥
source link: https://www.cnblogs.com/JulianHuang/p/16867844.html
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3min快速掌握Go语言正/反向代理的姿势
先重温一下什么叫反向代理,正向代理。
所谓正向,反向代理取决于代理的是出站请求,还是入站请求。
正向代理: 代理的出站请求, 客户端能感知到代理程序,架构上距离客户端更近。
反向代理: 代理的是入站请求,客户端认为代理程序就是服务器,客户端感知不到代理逻辑,架构上距离服务端更近。
前几天利用golang实现了反向代理程序,引出了Host请求头在反代中的关键作用。
对于proxy.com的请求,都被透明无感代理到A.com
package main
import (
"fmt"
"log"
"net/http"
"net/http/httputil"
)
func ReverseProxyHandler(w http.ResponseWriter, r *http.Request) {
fmt.Println("receive a request from:", r.RemoteAddr, r.Header)
target := "www.baidu.com"
director := func(req *http.Request) {
req.URL.Scheme = "https"
req.URL.Host = target
req.Host = target
}
proxy := &httputil.ReverseProxy{Director: director}
proxy.ServeHTTP(w, r)
}
func main() {
fmt.Printf("Starting server at port 8080\n")
if err := http.ListenAndServe(":8080", http.HandlerFunc(ReverseProxyHandler)); err != nil {
log.Fatal(err)
}
}
这几天刚好遇到了一个正常代理的case, 简单记录一下。
package main
import (
"fmt"
"log"
"net/http"
"net/http/httputil"
)
func ProxyHandler(w http.ResponseWriter, r *http.Request) {
fmt.Printf("receive a request from {0} {1}: \n", r.RemoteAddr, r.Header)
if r.Host != "localhost:8080" {
director := func(req *http.Request) {
req.URL.Scheme = "http"
req.URL.Host = r.Host
req.Host = r.Host
}
proxy := &httputil.ReverseProxy{Director: director}
proxy.ServeHTTP(w, r)
} else {
http.NotFound(w, r)
}
}
func main() {
if err := http.ListenAndServe(":8080", http.HandlerFunc(ProxyHandler)); err != nil {
log.Fatal(err)
}
}
其中要注意的就是,正向代理式要规避死循环代理。
使用该服务作为代理程序,将可以出站访问任何地址。
使用时,针对httpclient设置proxy
//adding the proxy settings to the Transport object
transport := &http.Transport{
Proxy: http.ProxyURL(proxyURL),
}
//adding the Transport object to the http Client
client := &http.Client{
Transport: transport,
}
下面使用curl指令演示(-x 后接代理地址)curl -x 127.0.0.1:8080 www.baidu.com
GO快闪#
本文总结了go语言正反向代理的姿势。
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