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The Sec-WebSocket-Accept header is used in the websocket opening handshake. It would appear in the response headers. That is, this is header is sent from server to client to inform that server is willing to initiate a websocket connection.

Header type Response header
Forbidden header name no


Sec-WebSocket-Accept: <hashed key>


<hashed key>

The server takes the value of the Sec-WebSocket-Key sent in the handshake request, appends 258EAFA5-E914-47DA-95CA-C5AB0DC85B11, takes SHA-1 of the new value, and is then base64 encoded.


Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=


Specification Title
RFC 6455, section 11.3.3: Sec-WebSocket-Accept The WebSocket Protocol

See also

Browser compatibility

No compatibility data found. Please contribute data for "http.headers.Sec-WebSocket-Accept" (depth: 1) to the MDN compatibility data repository.