Debugging backend urls


I’ve started haproxy using -d and I’m watching the output to figure out why I’m getting a 404 to the frontend but I’m not seeing the actual url requested to the back end. In the front end I see this:

00000000:frontend-http.clireq[000a:ffffffff]: GET /rd/eac29cced489c9000 HTTP/1.1

but in the back end it shows

00000000:backend-hitpath.srvrep[000a:adfd]: HTTP/1.1 404 Not Found

without the url.

In the backend I have this code:

http-request set-uri %[url,regsub(^/rd,/,)]

which is working fine in another server but it’s not working as expected on this server and I want to verify the url that’s being called behind the scenes.


If need to do this in haproxy (as opposed to reading the log file of the backend), use the logging functionality instead of debug mode. By configuring a custom logging format you should be able to log the same value:

 log syslog debug
 log global
 mode http
 option httplog
    log-format "%ci:%cp [%tr] %ft %b/%s %TR/%Tw/%Tc/%Tr/%Ta %ST %B %CC \
                %CS %tsc %ac/%fc/%bc/%sc/%rc %sq/%bq %hr %hs %{+Q}r rewrite:%[url,regsub(^/rd,/,)]"