websocket header

The WebSocket protocol is a standard communication protocol used for real-time communication between a client and server. It uses a specific header format to exchange messages between the client and server.

The WebSocket header consists of several fields, including:

1. Upgrade: This field indicates that the client is requesting an upgrade to the WebSocket protocol.

2. Connection: This field indicates that the client wants to establish a persistent connection with the server.

3. Sec-WebSocket-Key: This field contains a random string that is used to establish the WebSocket connection.

4. Sec-WebSocket-Version: This field specifies the version of the WebSocket protocol being used.

5. Sec-WebSocket-Extensions: This field specifies any extensions to the WebSocket protocol that are being used.

6. Origin: This field specifies the origin of the request.

7. Sec-WebSocket-Accept: This field contains a hash of the Sec-WebSocket-Key value, which is used to confirm the WebSocket connection.

8. Sec-WebSocket-Protocol: This field specifies the subprotocol being used if any.

These fields are included in the WebSocket handshake between the client and server to establish the connection. Once the connection is established, the client and server can exchange messages in real-time.