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A stream socket provides a sequenced and unique flow of error-free data without record boundaries, with well-defined mechanisms for creating and destroying connections and reporting errors. A stream socket transmits data reliably, in order, and with out-of-band capabilities. On the Internet, stream sockets are typically implemented using TCP so ...
When a socket is ungraciously closed, either by the user or because of a process crash, the kernel socket cleanup code will by its own initiative issue a FIN/ERROR message to the peer. When contact to a cluster node is lost, the local link layer will issue FIN/ERROR messages to all sockets having connections towards that node.
The client sends an HTTP request (method GET, version ≥ 1.1) and the server returns an HTTP response with status code 101 (Switching Protocols) on success.This means a WebSocket server can use the same port as HTTP (80) and HTTPS (443) because the handshake is compatible with HTTP.
After the timeout, the client enters the CLOSED state and the local port becomes available for new connections. [ 32 ] It is also possible to terminate the connection by a 3-way handshake, when host A sends a FIN and host B replies with a FIN & ACK (combining two steps into one) and host A replies with an ACK.
Under HTTP 1.0, connections should always be closed by the server after sending the response. [1]Since at least late 1995, [2] developers of popular products (browsers, web servers, etc.) using HTTP/1.0, started to add an unofficial extension (to the protocol) named "keep-alive" in order to allow the reuse of a connection for multiple requests/responses.
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The initial descriptor remains a listening descriptor, and accept() can be called again at any time with this socket, until it is closed. Communicating with the remote host with the API functions send() and recv(), as well as with the general-purpose functions write() and read(). Closing each socket that was opened after use with function close()
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