STOMP Connection Error

[sincang]

When connecting directly to a Spring Boot WebSocket service, I am not getting an error. When thought the gateway, I am not able to connect. When I check the headers during handshake, gateway is not specifying the sub protocols. Please see the images for reference.

Directly to the websocket service

Through gateway

[spencergibb]

What version are you using?

[sincang]

I was using M5 then tried M6. It is same error.

[spencergibb]

Please try with snapshots?

[sincang]

Same error with 2.0.0.BUILD-SNAPSHOT.

[sincang]

I may have found the issue. Will provide detail shortly.

[sincang]

As shown below, the request header for Sec-WebSocket-Protocol is "v10.stomp, v11.stomp". When establishing the handshake, my Spring Websocket only return "V10.stomp". What happened was org.springframework.web.reactive.socket.server.support.HandshakeWebSocketService is comparing 2 different strings when trying to if the protocol is supported.

Fix is in WebsocketRoutingFilter.
Change at line 63 to below

List<String> protocols = headers.get(SEC_WEBSOCKET_PROTOCOL);
to
List<String> protocols = headers.get(SEC_WEBSOCKET_PROTOCOL).stream() .flatMap(p -> Arrays.stream(p.split(","))) .map(String::trim) .collect(Collectors.toList());

The value in the header just needed to be broken down.

[spencergibb]

Thanks, @sincang for the detailed investigation. Made for an easy fix and test.

[sincang]

Thanks also for the free software.

[kentoj]

Lol I wasted about 5 hours on this today. Thanks for having this here!