From 73405436159b5953f6ed107f45d7aa3badf4bf44 Mon Sep 17 00:00:00 2001
From: Hector Sanjuan <code@hector.link>
Date: Sat, 4 Apr 2020 02:06:06 +0200
Subject: [PATCH] corehttp: Gateway handler: add Allow headers when returning
 MethodNotAllowed

Spec says that response with 405 must set Allow headers.
---
 core/corehttp/gateway_handler.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/corehttp/gateway_handler.go b/core/corehttp/gateway_handler.go
index d3c4d26392d..d26f21d54a2 100644
--- a/core/corehttp/gateway_handler.go
+++ b/core/corehttp/gateway_handler.go
@@ -127,6 +127,9 @@ func (i *gatewayHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if !i.config.Writable {
 		status = http.StatusMethodNotAllowed
 		errmsg = errmsg + "read only access"
+		w.Header().Add("Allow", http.MethodGet)
+		w.Header().Add("Allow", http.MethodHead)
+		w.Header().Add("Allow", http.MethodOptions)
 	} else {
 		status = http.StatusBadRequest
 		errmsg = errmsg + "bad request for " + r.URL.Path