Hello all,
My problem is that my AppDev group has some web applications generating reports
that are taking a very long time to run which is resulting in 504s. An example
httplog entry is below.
Apr 19 10:53:42 xxxxxxxxx haproxy[6173]: XX.XX.XX.XX:2499
[19/Apr/2022:10:52:32.339]
http-in-VIPX-XXXXXXXXXX-UAT Cluster_XXXXXXXXXX_UAT/hostname.com
0/0/0/-1/70001 504 262 - - sH-- 3/3/0/0/0 0/0
"GET /XXXXXXX/Reports/SubmitReportDownload?FileTypeID=1&ReportTypeID=1 HTTP/1.1"
My thinking was that this was due to the option “timeout server 70s” in my
defaults (hence the 70001 Ta value). There’s also the “sH--” session
termination state which, by my interpretation, means “server side timeout
waiting for response Headers” which also seems to point to the server side
timeout. Because of these, I decided to leave the default at 70 seconds and
override it in the backend by setting “timeout server 120s” (the 120s proposed
by AppDev). This had no effect so I tried multiple values (and some other
timeout parameters) all to no effect. Finally, given this is my Dev/UAT NLB, I
tried changing the default “timeout server” to 120s and, still, no effect. The
web server in this case is IIS and AppDev says the reports work going directly
so it seems to be something specific to my haproxy config (the relevant part of
which is below).
I am obviously missing something. Am I right that this is timeout related?
And, if so, what options should I be setting and at what level
(default/frontend/backend) to allow these long running reports to complete
while going through the NLB?
Thanks for taking the time and any insight you can provide will be greatly
appreciated.
Dan.
defaults
log global
mode http
option httplog
option dontlognull
option log-health-checks
option forwardfor
timeout connect 20s
timeout client 120s
timeout server 120s
frontend https-in-VIP10-AD-APPENV-UAT
bind XX.XX.XX.XX:80
bind XX.XX.XX.XX:443 ssl crt /path/to/file.pem
mode http
option http-keep-alive
timeout client 2m
http-request add-header X-Forwarded-Proto https
http-request add-header X-Forwarded-Port 443
-= snip more stuff =-
default_backend Cluster_XXXXXXXX_UAT
backend Cluster_XXXXXXXX_UAT
mode http
server host host check port 80 inter 5000 fall 2 rise 3 maxconn 64
