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A simple google reverse proxy in Golang
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| // grproxy project main.go | |
| package main | |
| import ( | |
| "net/http" | |
| "net/http/httputil" | |
| "net/url" | |
| "strings" | |
| ) | |
| func main() { | |
| target, _ := url.Parse("http://www.google.com") | |
| r := &httputil.ReverseProxy{ | |
| Director: func(req *http.Request) { | |
| req.URL.Scheme = target.Scheme | |
| req.URL.Host = target.Host | |
| req.Host = target.Host //这才是关键 | |
| req.URL.Path = singleJoiningSlash(target.Path, req.URL.Path) | |
| if target.RawQuery == "" || req.URL.RawQuery == "" { | |
| req.URL.RawQuery = target.RawQuery + req.URL.RawQuery | |
| } else { | |
| req.URL.RawQuery = target.RawQuery + "&" + req.URL.RawQuery | |
| } | |
| }, | |
| } | |
| http.Handle("/", r) | |
| http.ListenAndServe(":80", nil) | |
| } | |
| 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 | |
| } |
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