Websocket connections fails when headers are case sensitive

Trying to access a third party web application having websocket connections through spring cloud gateway

All http requests are success but websocket connections fails with io.netty.handler.codec.http.websocketx.WebSocketClientHandshakeException: Invalid handshake response getStatus: 404

While examining the packets observed that request headers are sent in lower case letters (upgrade, connection and sec-websocket-key) from netty > io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker13

headers.set(HttpHeaderNames.UPGRADE, HttpHeaderValues.WEBSOCKET).set(HttpHeaderNames.CONNECTION, HttpHeaderValues.UPGRADE).set(HttpHeaderNames.SEC_WEBSOCKET_KEY, key);

Unfortunately the third party web application I am trying to access is expecting case sensitive headers. Is there a way I can override these headers?

Netty version : reactor-netty 1.0.8

JDK 1.8

OS : Ubuntu 20.04

[violetagg]

@slandelle @hyperxpro I had reported it to their technical team. In my scenario this third party application can be from vendors. So just want to make sure it doesn’t break even if it is not fixed in their end.

In my opinion the third party component that violates the RFC should be fixed

[slandelle]

@Jerry29 You should report this issue to the broken third party application so they fix it instead of trying to fork the valid implementation in Netty.