Full record url in nginx log - nginx

Question

We use following nginx site configure file in our production env.
log_format main '$http_x_forwarded_for - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" $request_time';
server {
root /srv/www/web;
server_name *.test.com;
access_log /var/log/nginx/xxx.test.com.access.log main;
Both "http://a.test.com/ping" and "http://b.test.com/ping" http request will be record in file xxx.test.com.access.log.
But there is a problem, nginx don't store "domain name" in xxx.test.com.access.log.
"http://a.test.com/ping" and "http://b.test.com/ping" share the same request "Get /ping".
How can I record "a.test.com" or "b.test.com" in nginx log?

Answer 1

Try adding the $host variable in log_format:
log_format main '$http_x_forwarded_for - $remote_user [$time_local] "$host" "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" $request_time';
http://wiki.nginx.org/HttpCoreModule#.24host:
$host
This variable is equal to line Host in the header of request or name
of the server processing the request if the Host header is not
available.
This variable may have a different value from $http_host in such
cases: 1) when the Host input header is absent or has an empty value,
$host equals to the value of server_name directive; 2) when the value
of Host contains port number, $host doesn't include that port number.
$host's value is always lowercase since 0.8.17.

Answer 2

If you want to log the full requested url, then my method is
log_format main '$http_x_forwarded_for - $remote_user [$time_local] '
'"$request_method $scheme://$host$request_uri $server_protocol" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" $request_time';
So splitting the $request into its constituent parts and popping $host in the middle. Also lets you see if the request is http or https.