first commit

.gitignore

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+.idea
+/tmp
+*.exe
+*.exe~

go.mod

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+module go-reverse-proxy
+
+go 1.15
+
+require (
+)

handle.go

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+package main
+
+import (
+	"log"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"strings"
+)
+
+type RProxy struct {
+	remote *url.URL
+}
+
+func GoReverseProxy(this *RProxy) *httputil.ReverseProxy {
+	remote := this.remote
+
+	proxy := httputil.NewSingleHostReverseProxy(remote)
+
+	proxy.Director = func(request *http.Request) {
+		targetQuery := remote.RawQuery
+		request.URL.Scheme = remote.Scheme
+		request.URL.Host = remote.Host
+		request.Host = remote.Host // todo 这个是关键
+		request.URL.Path, request.URL.RawPath = joinURLPath(remote, request.URL)
+
+		if targetQuery == "" || request.URL.RawQuery == "" {
+			request.URL.RawQuery = targetQuery + request.URL.RawQuery
+		} else {
+			request.URL.RawQuery = targetQuery + "&" + request.URL.RawQuery
+		}
+		if _, ok := request.Header["User-Agent"]; !ok {
+			// explicitly disable User-Agent so it's not set to default value
+			request.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36")
+		}
+		log.Println("request.URL.Path：", request.URL.Path, "request.URL.RawQuery：", request.URL.RawQuery)
+	}
+
+	// 修改响应头
+	proxy.ModifyResponse = func(response *http.Response) error {
+		response.Header.Add("Access-Control-Allow-Origin", "*")
+		response.Header.Add("Reverse-Proxy-Server-PowerBy", "(Hzz)https://hzz.cool")
+		return nil
+	}
+
+	return proxy
+}
+
+// go sdk 源码
+func joinURLPath(a, b *url.URL) (path, rawpath string) {
+	if a.RawPath == "" && b.RawPath == "" {
+		return singleJoiningSlash(a.Path, b.Path), ""
+	}
+	// Same as singleJoiningSlash, but uses EscapedPath to determine
+	// whether a slash should be added
+	apath := a.EscapedPath()
+	bpath := b.EscapedPath()
+
+	aslash := strings.HasSuffix(apath, "/")
+	bslash := strings.HasPrefix(bpath, "/")
+
+	switch {
+	case aslash && bslash:
+		return a.Path + b.Path[1:], apath + bpath[1:]
+	case !aslash && !bslash:
+		return a.Path + "/" + b.Path, apath + "/" + bpath
+	}
+	return a.Path + b.Path, apath + bpath
+}
+
+// go sdk 源码
+func singleJoiningSlash(a, b string) string {
+	aslash := strings.HasSuffix(a, "/")
+	bslash := strings.HasPrefix(b, "/")
+	switch {
+	case aslash && bslash:
+		return a + b[1:]
+	case !aslash && !bslash:
+		return a + "/" + b
+	}
+	return a + b
+}

main.go

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+package main
+
+import (
+	"flag"
+	"log"
+	"net/http"
+	"net/url"
+)
+
+func main() {
+	port := flag.String("p", "1874", "本地监听的端口")
+	reverseUrl := flag.String("r", "https://hzz.cool", "需要代理的地址")
+	flag.Parse()
+
+	remote, err := url.Parse(*reverseUrl)
+	if err != nil {
+		panic(err)
+	}
+
+	proxy := GoReverseProxy(&RProxy{
+		remote: remote,
+	})
+
+	log.Println("当前代理地址： " + *reverseUrl + " 本地监听： http://127.0.0.1:" + *port)
+
+	serveErr := http.ListenAndServe(":"+*port, proxy)
+
+	if serveErr != nil {
+		panic(serveErr)
+	}
+}

readme.md

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+# go-reverse-proxy
+
+> 基于go实现简单http/https的反向代理服务
+
+## 使用
+- windows64 直接下载 release 
+- 编译
+```
+git clone 
+cd go-reverse-proxy
+
+# 编译
+go build -ldflags "-s -w"
+
+# 执行启动
+./go-reverse-proxy
+```
+
+## 参数说明
+```
+./go-reverse-proxy.exe -h
+
+-p string
+      本地监听的端口 (default "1874")
+-r string
+      需要代理的地址 (default "https://hzz.cool")
+```