[9.5-4] SHOULD: A server SHOULD sustain persistent connections, when possible, and allow the underlying transport's ...

[saviorand]

RFC 9112 Requirement

Section: 9.5-4
Keyword: SHOULD

A server SHOULD sustain persistent connections, when possible, and allow the underlying transport's flow-control mechanisms to resolve temporary overloads rather than terminate connections with the expectation that clients will retry. The latter technique can exacerbate network congestion or server load.¶

Reference: https://www.rfc-editor.org/rfc/rfc9112.html#section-9.5-4