Allow headers to be set on WebSocketConnectionManager [SPR-10796]

[spring-projects-issues]

Gunnar Hillert opened SPR-10796 and commented

The MTGOX websocket endpoint does not work with the by-default generated ORIGIN header and the handshake will fail as MTGOX expects a specific header.

See: https://java.net/jira/browse/TYRUS-180

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Affects: 4.0 M2

Referenced from: commits 172a0b9