On Fri, Dec 19, 2025 at 01:10:16PM +0100, Hank Bowen wrote: > > [...] > OK but the quoted fragment suggests that it is possible to have a single TCP > haproxy <-> server connection with streams (in case of HTTP/2 - HTTP/2 > streams as I understand) of different sessions (although it would require at > least "aggressive" mode of http-reuse). But having considered that the > connection is recognized idle only after all requests have been sent and got > their entire responses, I cannot see any possibility for that.
Protocols such as HTTP/2 supports multiplexing, i.e. multiple requests/responses can be exchanged in parallel. Thus, even if an HTTP/2 connection is not idle, it can be reused unless there is already too many active streams on it. Such connections are labelled internally as "available". BTW, this behavior is not identical for QUIC as the protocol does not suffer from the same head-of-line blocking limitation, hence a connection can be used in parallel by multiple sessions even in http-reuse safe level. -- Amaury Denoyelle
