Andrey Mizurov f40b4f15a6 Override Sec-WebSocket-Protocol websocket handshake response header after custom headers to avoid duplication (#10793) ... Motivation: According rfc (https://tools.ietf.org/html/rfc6455#section-11.3.4), `Sec-WebSocket-Protocol` header field MUST NOT appear more than once in an HTTP response. At the moment we can pass `Sec-WebSocket-Protocol` via custom headers and it will be added to response. Modification: Change method add() to set() for avoid duplication. If we pass sub protocols in handshaker constructor it means that they are preferred over custom ones. Result: Less error prone behavior.		2020-11-19 09:49:44 +01:00
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main	Override Sec-WebSocket-Protocol websocket handshake response header after custom headers to avoid duplication (#10793)	2020-11-19 09:49:44 +01:00
test	Override Sec-WebSocket-Protocol websocket handshake response header after custom headers to avoid duplication (#10793)	2020-11-19 09:49:44 +01:00