Hi all i was hoping for some help with see if this is a bug or a mis config
i have a config which works fine in 1.7.9 and 1.7.11, but when running it 1.8.13 is seems to fail to respond to the client I've simplified down and anonymised the config, but basically it's being used to do A/B failiover at haproxy so it uses nested frontend and backends with unix sockets to achieve this The config is ------ global pidfile /var/run/haproxy.pid stats socket /var/run/haproxy.sock mode 600 level admin stats timeout 2m maxconn 4000 unix-bind user root mode 666 daemon defaults timeout connect 15s timeout server 1m timeout http-request 15s timeout check 15s frontend frontend1 bind 127.0.0.1:8080 mode http timeout client 1m default_backend api frontend api-A bind /var/run/haproxy/api-A.sock mode http default_backend api-A frontend api-B bind /var/run/haproxy/api-B.sock mode http default_backend api-B backend api mode http balance roundrobin server api-A /var/run/haproxy/api-A.sock disabled server api-B /var/run/haproxy/api-B.sock backend api-A mode http balance roundrobin option forwardfor server server-1-A <redacted> server server-2-B <redacted> backend api-B mode http balance roundrobin option forwardfor server server-1-B <redacted> server server-2-B <redacted> --------- When running with 1.7.11, its all nice and quick curl http://10.2.74.41:8443 -vvv * Rebuilt URL to: http://10.2.74.41:8443/ * Trying 10.2.74.41... * TCP_NODELAY set * Connected to 10.2.74.41 (10.2.74.41) port 8443 (#0) > GET / HTTP/1.1 > Host: 10.2.74.41:8443 > User-Agent: curl/7.61.0 > Accept: */* > < HTTP/1.1 404 Not Found < Content-Type: application/problem+json; charset=utf-8 < Date: Tue, 11 Sep 2018 07:50:54 GMT < Content-Length: 27 < * Connection #0 to host 10.2.74.41 left intact 00000004:frontend1.accept(0005)=0008 from [10.2.74.41:44161] 00000004:frontend1.clireq[0008:ffffffff]: GET / HTTP/1.1 00000004:frontend1.clihdr[0008:ffffffff]: Host: 10.2.74.41:8443 00000004:frontend1.clihdr[0008:ffffffff]: User-Agent: curl/7.61.0 00000004:frontend1.clihdr[0008:ffffffff]: Accept: */* 00000005:api-B.accept(0007)=000a from [unix:1] 00000005:api-B.clireq[000a:ffffffff]: GET / HTTP/1.1 00000005:api-B.clihdr[000a:ffffffff]: Host: 10.2.74.41:8443 00000005:api-B.clihdr[000a:ffffffff]: User-Agent: curl/7.61.0 00000005:api-B.clihdr[000a:ffffffff]: Accept: */* 00000005:api-B.srvrep[000a:000b]: HTTP/1.1 404 Not Found 00000005:api-B.srvhdr[000a:000b]: Content-Type: application/problem+json; charset=utf-8 00000005:api-B.srvhdr[000a:000b]: Date: Tue, 11 Sep 2018 07:51:22 GMT 00000005:api-B.srvhdr[000a:000b]: Content-Length: 27 00000004:api.srvrep[0008:0009]: HTTP/1.1 404 Not Found 00000004:api.srvhdr[0008:0009]: Content-Type: application/problem+json; charset=utf-8 00000004:api.srvhdr[0008:0009]: Date: Tue, 11 Sep 2018 07:51:22 GMT 00000004:api.srvhdr[0008:0009]: Content-Length: 27 00000007:frontend1.clicls[0008:0009] 00000007:frontend1.closed[0008:0009] 00000006:api-B.clicls[000a:000b] 00000006:api-B.closed[000a:000b] however with 1.8.13 the client doesn't gets the response and ends up with a 504, however the haproxy debug log shows the response is reviced by haproxy, but never passed to the client curl http://10.2.74.41:8443 -vvv * Rebuilt URL to: http://10.2.74.41:8443/ * Trying 10.2.74.41... * TCP_NODELAY set * Connected to 10.2.74.41 (10.2.74.41) port 8443 (#0) > GET / HTTP/1.1 > Host: 10.2.74.41:8443 > User-Agent: curl/7.61.0 > Accept: */* > *** HANGS HERE TILL 504 **** from haproxy 00000000:frontend1.accept(0006)=000b from [10.2.74.41:57043] ALPN=<none> 00000000:frontend1.clireq[000b:ffffffff]: GET / HTTP/1.1 00000000:frontend1.clihdr[000b:ffffffff]: Host: 10.2.74.41:8443 00000000:frontend1.clihdr[000b:ffffffff]: User-Agent: curl/7.61.0 00000000:frontend1.clihdr[000b:ffffffff]: Accept: */* 00000001:api-A.accept(0007)=000d from [unix:1] ALPN=<none> 00000001:api-A.clireq[000d:ffffffff]: GET / HTTP/1.1 00000001:api-A.clihdr[000d:ffffffff]: Host: 10.2.74.41:8443 00000001:api-A.clihdr[000d:ffffffff]: User-Agent: curl/7.61.0 00000001:api-A.clihdr[000d:ffffffff]: Accept: */* 00000001:api-A.srvrep[000d:000e]: HTTP/1.1 404 Not Found 00000001:api-A.srvhdr[000d:000e]: Content-Type: application/problem+json; charset=utf-8 00000001:api-A.srvhdr[000d:000e]: Date: Tue, 11 Sep 2018 07:48:39 GMT 00000001:api-A.srvhdr[000d:000e]: Content-Length: 27 ** 5 seconds 00000002:api-A.clicls[adfd:ffffffff] 00000002:api-A.closed[adfd:ffffffff] ** 15 seconds 00000000:api.srvcls[000b:adfd] 00000000:api.clicls[adfd:adfd] 00000000:api.closed[adfd:adfd] any idea why this happens? sorry for long post! Dave