Is keep-alive corresponding to interface reuse or domain name reuse?

RT
whether the keep-alive in the HTTP request corresponds to interface reuse or domain name reuse.
has been learning this knowledge recently, and inadvertently sees this problem and looks confused again.

Mar.23,2021

keep-alive is the reuse of the corresponding domain name, more specifically, it refers to the underlying TCP connection reuse.
HTTP is based on TCP, and each HTTP request requires a three-step handshake. If a page has multiple requests for a domain name, connections will be established and disconnected frequently. So in HTTP 1.0, Connection: keep-alive, is used to establish persistent connections, which is what we call Keep-Alive mode. The following figure shows a comparison of requests in normal mode and long connection mode:
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:https://segmentfault.com/a/11...
ChromeNetworkInitial connection

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bf2d79-534c7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf2d79-534c7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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