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A basic reverse proxy with CORS
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| package main | |
| import ( | |
| "flag" | |
| "fmt" | |
| "log" | |
| "net/http" | |
| "net/http/httputil" | |
| "net/url" | |
| ) | |
| type ReverseProxyHandler struct { | |
| target *url.URL | |
| proxy *httputil.ReverseProxy | |
| } | |
| func (rph ReverseProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
| w.Header().Set("Access-Control-Allow-Origin", "*") | |
| w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE") | |
| w.Header().Set("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization") | |
| r.URL.Host = rph.target.Host | |
| r.URL.Scheme = rph.target.Scheme | |
| r.Header.Set("X-Forwarded-Host", r.Header.Get("Host")) | |
| r.Host = rph.target.Host | |
| rph.proxy.ServeHTTP(w, r) | |
| } | |
| func main() { | |
| const PORT = 8080 | |
| u := flag.String("host", "", "backend URL host to proxy request to") | |
| flag.Parse() | |
| target, _ := url.Parse(*u) | |
| reverseProxyHandler := ReverseProxyHandler{target: target, proxy: httputil.NewSingleHostReverseProxy(target)} | |
| http.Handle("/", reverseProxyHandler) | |
| log.Printf("Proxy server listening on port: %d", PORT) | |
| log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", PORT), nil)) | |
| } |
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