Support using the negotiated WebSocket sub-protocol [SPR-10786]

[spring-projects-issues]

Rossen Stoyanchev opened SPR-10786 and commented

Although STOMP is a supported WebSocket sub-protocol, currently it is used irrespective of the sub-protocol that may have been negotiated during the WebSocket handshake.

This is of course convenient if STOMP is the only sub-protocol that an application plans to support. However it should also be possible to have the negotiated sub-protocol determine what is used. That way more than one sub-protocol can be supported and negotiated at runtime.

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Affects: 4.0 M2

This issue is a sub-task of #13994

[spring-projects-issues]

Rossen Stoyanchev commented

WebSocketSession now provides access to the accepted sub-protocol.