fixed cross domain

main.go

@@ -8,6 +8,8 @@ import (
 
 	"git.loafle.net/overflow/overflow_service_websocket/config"
 	"git.loafle.net/overflow/overflow_service_websocket/server"
+	"strings"
+	"github.com/golang/glog"
 )
 
 const (
@@ -53,7 +55,7 @@ func main() {
 		})
 	})
 
-	http.Handle("/rpc", ws.HTTPHandler())
+	http.Handle("/rpc", allowCORS(ws.HTTPHandler()))
 	log.Printf("Address: %s, UseTLS: %t", addr, useTLS)
 
 	if err := http.ListenAndServe(addr, nil); err != nil {
@@ -61,6 +63,30 @@ func main() {
 	}
 }
 
+//https://github.com/grpc-ecosystem/grpc-gateway/blob/master/examples/main.go
+
+func allowCORS(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if origin := r.Header.Get("Origin"); origin != "" {
+			w.Header().Set("Access-Control-Allow-Origin", origin)
+			if r.Method == "OPTIONS" && r.Header.Get("Access-Control-Request-Method") != "" {
+				preflightHandler(w, r)
+				return
+			}
+		}
+		h.ServeHTTP(w, r)
+	})
+}
+
+func preflightHandler(w http.ResponseWriter, r *http.Request) {
+	headers := []string{"Content-Type", "Accept"}
+	w.Header().Set("Access-Control-Allow-Headers", strings.Join(headers, ","))
+	methods := []string{"GET", "HEAD", "POST", "PUT", "DELETE"}
+	w.Header().Set("Access-Control-Allow-Methods", strings.Join(methods, ","))
+	glog.Infof("preflight request for %s", r.URL.Path)
+	return
+}
+
 func loadConfig() *config.Config {
 	os.Chdir("./")
 	wd, _ := os.Getwd()