add cors

cmd/evening_detective_server/main.go

@@ -107,6 +107,7 @@ func main() {
 			scenarioService,
 		),
 	)
+
 	// Serve gRPC server
 	log.Println("Serving gRPC on 0.0.0.0:8080")
 	go func() {
@@ -142,10 +143,22 @@ func main() {
 
 	gwServer := &http.Server{
 		Addr:    ":8090",
-		Handler: mainMux,
+		Handler: cors(mainMux),
 	}
 
 	log.Println("Serving gRPC-Gateway on http://0.0.0.0:8090")
 	log.Println("Serving docs on http://0.0.0.0:8090/docs")
 	log.Fatalln(gwServer.ListenAndServe())
 }
+
+func cors(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE")
+		w.Header().Set("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, Authorization, ResponseType, X-Id, X-Password")
+		if r.Method == "OPTIONS" {
+			return
+		}
+		h.ServeHTTP(w, r)
+	})
+}