Baseline Widely available
The HTTP Connection header controls whether the network connection stays open after the current transaction finishes. If the value sent is keep-alive, the connection is persistent and not closed, allowing subsequent requests to the same server on the same connection.
Warning: Connection-specific header fields such as Connection and Keep-Alive are prohibited in HTTP/2 and HTTP/3. Chrome and Firefox ignore them in HTTP/2 responses, but Safari conforms to the HTTP/2 spec requirements and does not load any response that contains them.
All hop-by-hop headers, including the standard hop-by-hop headers (Keep-Alive, Transfer-Encoding, TE, Connection, Trailer, Upgrade, Proxy-Authorization, and Proxy-Authenticate) must be listed in the Connection header, so that the first proxy knows it has to consume them and not forward them further.
The default value of Connection changed between HTTP/1.0 and HTTP/1.1. Therefore, to ensure backwards compatibility, browsers often send Connection: keep-alive explicitly, even though it's the default in HTTP/1.1.
Connection: keep-alive
Connection: close
close
Indicates that either the client or the server would like to close the connection. This is the default on HTTP/1.0 requests.
Indicates that the client would like to keep the connection open. Keeping a connection open is the default on HTTP/1.1 requests. The list of headers are the name of the header to be removed by the first non-transparent proxy or cache in-between: these headers define the connection between the emitter and the first entity, not the destination node.
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