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What is SEC WebSocket protocol?
The Sec-WebSocket-Protocol header specifies one or more WebSocket protocols that you wish to use, in order of preference. The first one that is supported by the server will be selected and returned by the server in a Sec-WebSocket-Protocol header included in the response.
What is Ping and Pong in WebSocket?
A ping or pong is just a regular frame, but it’s a control frame. Pings have an opcode of 0x9 , and pongs have an opcode of 0xA . When you get a ping, send back a pong with the exact same Payload Data as the ping (for pings and pongs, the max payload length is 125).
What does the WebSocket protocol status code 1004 means?
The connection is being terminated because the endpoint received data of a type it cannot accept (for example, a text-only endpoint received binary data). 1004.
Where does the Sec WebSocket Key come from?
The first piece of information comes from the |Sec-WebSocket-Key| header field in the client handshake:
What does the invalid Sec-WebSocket-Accept header mean?
Which means any cached result from a proxy will contain an invalid “Sec-WebSocket-Accept” reply header and thus the websocket connection will fail instead of reading cached data unintentionally. The server says: Undefined index Sec-WebSocket-Key. When I access the site from mobile.
How is a WebSocket connection established in a server?
WebSocket connections are established by upgrading an HTTP request/response pair. A client that supports WebSockets and wants to establish a connection will send an HTTP request that includes a few required headers: The Connection header generally controls whether or not the network connection stays open after the current transaction finishes.
How to upgrade Sec-WebSocket-protocol-codeproject?
1700. 102 Safari/537. 36 Response Headers Connection:Upgrade Sec-WebSocket-Accept:L6wqtsHk6dzD+kd9NCYT6Wt7OCU= Sec-WebSocket-Protocol:myprotocol <– server replies ok Upgrade:WebSocket In fact the client can request a number of protocols like this: