external/websocket : fix key length error When handshake, client informs "error key length". Client should use WEBSOCKET_ACCEPT_KEY_LEN to judge the length of accept key instead of WEBSOCKET_CLIENT_KEY_LEN.
external/websocket : fix key length error
When handshake, client informs "error key length". Client should use WEBSOCKET_ACCEPT_KEY_LEN to judge the length of accept key instead of WEBSOCKET_CLIENT_KEY_LEN.

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