Add Upgrader.NegotiateSubprotocol #606
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| LGTM; please address conflicts for a final review. |
| LGTM, someone else must approve/merge. |
ghost changed the title 
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| Thanks for the heads up @garyburd, @IngCr3at1on sorry for the late reply on this PR. Would you be willing to update the PR with Gary's concerns in mind? |
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Fixes #480 #404
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.