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HTTP persistent connection, also called HTTP keep-alive, or HTTP connection reuse, is the idea of using a single TCP connection to send and receive multiple HTTP requests/responses, as opposed to opening a new connection for every single request/response pair.
The Hypertext Transfer Protocol uses the keyword "Keep-Alive" in the "Connection" header to signal that the connection should be kept open for further messages (this is the default in HTTP 1.1, but in HTTP 1.0 the default was to use a new connection for each request/reply pair). [8] Despite the similar name, this function is entirely unrelated.
Connection: Control options for the current connection and list of hop-by-hop request fields. [13] Must not be used with HTTP/2. [14] Connection: keep-alive. Connection: Upgrade. Permanent RFC 9110: Content-Encoding: The type of encoding used on the data. See HTTP compression. Content-Encoding: gzip: Permanent RFC 9110: Content-Length
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
HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web, complementing the widely-deployed HTTP/1.1 and HTTP/2.
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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
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