Earlier i was not specifying a custom log format, and the captured request headers were getting printed fine. I wanted to log the unique-id-header, but could not find any way of doing so.
So i copy pasted the log-format mentioned on http://haproxy.1wt.eu/download/1.5/doc/configuration.txt, and unique id started getting logged.
Unfortunately, now the captured request headers are not getting logged. The %hrl and %hsl are coming out as empty strings.
Very weird. Here is my config, plzz help 🙁
listen server
bind *:80
mode http
option httplog
option http-server-close
no option logasap # disable early logging of HTTP requests so that total transfer time is logged
option forwardfor
capture request header X-Forwarded-For len 500
capture request header Host len 500
capture request header X-Request-UID len 500
rspadd X-Haproxy-Backend:\ server
# Generate the X-Haproxy-Unique-ID and log it to make it easy to track requests
log-format %Ci:%Cp\ [id=%ID]\ [%t]\ %f\ %b/%s\ %Tq/%Tw/%Tc/%Tr/%Tt\ %st\ %B\ %cc\ %cs\ %tsc\ %ac/%fc/%bc/%sc/%rc\ %sq/%bq\ {%hrl}\ {%hsl}\ %{+Q}r
unique-id-format %{+X}o\ %Ci:%Cp_%Fi:%Fp_%Ts_%rt:%pid
unique-id-header X-Haproxy-Unique-ID
Here is the log i see:
Sep 13 17:28:57 localhost haproxy[11979]: 10.161.27.218:41592
[id=0AA11BDA:A278_0AA15B71:0050_505217C5_0014:2ECB] [13/Sep/2012:17:28:37.567]
server www-example-com-healthz/- 19998/0/2/1/+20001 200 +326
- - ---- 10/10/1/1/0 0/0 {} {}
"GET /testing/healthz?merchant=www.example.com&source=elb HTTP/1.1"
Note that %hrl and %hsl are empty strings 🙁 How do i capture the request headers ??
Best Answer
by default, this fields will show empty in the logs. In order to log headers and cookies, the capture parameters must be set in the frontend.
Here is how we can capture headers sent by the client in the HTTP request.