internal/web/proxy: handle unsupported HTTP method

Author: nalves599

internal/web/proxy.go

@@ -25,6 +25,25 @@ const (
 	maxBodyBytes = 32 * 1024 * 1024
 )
 
+var djangoHTTPMethods = map[string]struct{}{
+	http.MethodGet:     {},
+	http.MethodHead:    {},
+	http.MethodPost:    {},
+	http.MethodPut:     {},
+	http.MethodPatch:   {},
+	http.MethodDelete:  {},
+	http.MethodOptions: {},
+	http.MethodTrace:   {},
+}
+
+func handleUnsupportedHTTPMethod(rw http.ResponseWriter, r *http.Request) bool {
+	if _, ok := djangoHTTPMethods[r.Method]; ok {
+		return false
+	}
+	http.Error(rw, "Unsupported HTTP method.", http.StatusNotImplemented)
+	return true
+}
+
 func (ws *WebServer) configureProxy() {
 	// Reverse proxy to the application server
 	director := func(req *http.Request) {
@@ -84,6 +103,10 @@ func (ws *WebServer) configureProxy() {
 			return
 		}
 
+		if handleUnsupportedHTTPMethod(rw, r) {
+			return
+		}
+
 		r.Body = http.MaxBytesReader(rw, r.Body, maxBodyBytes)
 		rp.ServeHTTP(rw, r)