Add Upgrader.NegotiateSubprotocol gorilla/websocket#606 #14
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tebruno99
merged commit 0f373df
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ElasticPerch:enhancement/12-add-upgradernegotiatesubprotocols
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Original PR: gorilla#606 by @AllenX2018
Fixes gorilla#480 gorilla#404 #12 #13
Summary of Changes
1.Add the method NegotiateSubprotocol func (r * http.Request) (string, error) in the upgrade, the user can customize the negotiation sub-protocol.
2. NegotiateSubprotocol has higher priority than Subprotocols.
3.The responseHeader does not support negotiated sub-protocol (Sec-WebSocket-Protocol),If necessary, please use Upgrader.NegotiateSubprotocol and Upgrader.Subprotocols,use the method to view the Upgrader struct.