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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.
The Keep Alive signal can be used to trick intermediate hosts to not close the connection due to inactivity. It is also possible that one host is no longer listening (e.g. application or system crash). In this case, the connection is closed, but no FIN was ever sent. In this case, a KeepAlive packet can be used to interrogate a connection to ...
Connection: Control options for the current connection and list of hop-by-hop response fields. [13] Must not be used with HTTP/2. [14] Connection: close: Permanent RFC 9110: Content-Disposition [51] An opportunity to raise a "File Download" dialogue box for a known MIME type with binary format or suggest a filename for dynamic content.
In HTTP/1.1 a keep-alive-mechanism was officially introduced so that a connection could be reused for more than one request/response. Such persistent connections reduce request latency perceptibly because the client does not need to re-negotiate the TCP 3-Way-Handshake connection after the first request has been sent.
With HTTP 1.1, persistent connections are the default so the keep-alive connection-token and the Keep-Alive: header are not needed anymore, instead HTTP 1.1 compliant clients and servers use the "Connection: close" header to tell the other end it want to close the persistent connection. When used, the Keep-Alive header seems to accept ...
However, such open connections can become idle and can subsequently be closed by network gateways, leading to the necessity of maintaining them by using a form of keepalive messages. [3] Keepalive messages are small messages that are sent between client and server that create traffic over a communication channel and therefore prevent gateway ...
It's official! Connections, the latest New York Times puzzle game to rock the internet, is now available on the New York Times Games app for iOS and Android devices after it was released on ...
A keepalive is a message sent by one device to another to check that the link between the two is operating, or to prevent the link from being broken. Keepalive or keep-alive may also refer to: HTTP keep-alive, using a single TCP connection to send and receive multiple HTTP requests/responses; Keep-alive electrode, of a krytron