I think I'm overlooking something simple, could someone spot check me? What I want to do is to pool connections on my http backend - keep HAProxy from opening a new connection to the same backend if there is an established connection that is idle.
My haproxy version is 1.5.18 In my defaults section I have: timeout http-request 5s timeout http-keep-alive 75s In my backend definition I have: mode http option http-keep-alive balance roundrobin What I see in the packet capture is: The client makes an http/1.1 request w/ no Connection header (haproxy -> backend) The server gives an an http/1.1 response with content-length and no connection header (backend -> haproxy) 5s later Haproxy closes the connection There is more then enough traffic going through the backend that if a connection is idle, there will be a request that could use it (within ms, should never hit the 5s or 75s timeouts), however in every case the connection just sites idle for five seconds then closes. Am I missing something simple to enable this behavior?

