diff options
| -rw-r--r-- | modules/caddyhttp/reverseproxy/reverseproxy.go | 25 | ||||
| -rw-r--r-- | modules/caddyhttp/reverseproxy/streaming.go | 1 |
2 files changed, 26 insertions, 0 deletions
diff --git a/modules/caddyhttp/reverseproxy/reverseproxy.go b/modules/caddyhttp/reverseproxy/reverseproxy.go index bcbc1ff46..123bf774b 100644 --- a/modules/caddyhttp/reverseproxy/reverseproxy.go +++ b/modules/caddyhttp/reverseproxy/reverseproxy.go @@ -569,6 +569,30 @@ func (h *Handler) proxyLoopIteration(r *http.Request, origReq *http.Request, w h return false, proxyErr } +// Mapping of the canonical form of the headers, to the RFC 6455 form, +// i.e. `WebSocket` with uppercase 'S'. +var websocketHeaderMapping = map[string]string{ + "Sec-Websocket-Accept": "Sec-WebSocket-Accept", + "Sec-Websocket-Extensions": "Sec-WebSocket-Extensions", + "Sec-Websocket-Key": "Sec-WebSocket-Key", + "Sec-Websocket-Protocol": "Sec-WebSocket-Protocol", + "Sec-Websocket-Version": "Sec-WebSocket-Version", +} + +// normalizeWebsocketHeaders ensures we use the standard casing as per +// RFC 6455, i.e. `WebSocket` with uppercase 'S'. Most servers don't +// care about this difference (read headers case insensitively), but +// some do, so this maximizes compatibility with upstreams. +// See https://github.com/caddyserver/caddy/pull/6621 +func normalizeWebsocketHeaders(header http.Header) { + for k, rk := range websocketHeaderMapping { + if v, ok := header[k]; ok { + delete(header, k) + header[rk] = v + } + } +} + // prepareRequest clones req so that it can be safely modified without // changing the original request or introducing data races. It then // modifies it so that it is ready to be proxied, except for directing @@ -655,6 +679,7 @@ func (h Handler) prepareRequest(req *http.Request, repl *caddy.Replacer) (*http. if reqUpType != "" { req.Header.Set("Connection", "Upgrade") req.Header.Set("Upgrade", reqUpType) + normalizeWebsocketHeaders(req.Header) } // Set up the PROXY protocol info diff --git a/modules/caddyhttp/reverseproxy/streaming.go b/modules/caddyhttp/reverseproxy/streaming.go index c871a3fa1..3fde10b35 100644 --- a/modules/caddyhttp/reverseproxy/streaming.go +++ b/modules/caddyhttp/reverseproxy/streaming.go @@ -66,6 +66,7 @@ func (h *Handler) handleUpgradeResponse(logger *zap.Logger, wg *sync.WaitGroup, // write header first, response headers should not be counted in size // like the rest of handler chain. copyHeader(rw.Header(), res.Header) + normalizeWebsocketHeaders(rw.Header()) rw.WriteHeader(res.StatusCode) logger.Debug("upgrading connection") |