Haproxy配置：
default加入：
option httpclose
option forwardfor
Tomcat配置：
server.xml中添加
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs"
prefix="localhost_access_log."
suffix=".txt"
pattern="%{X-FORWARDED-FOR}i %l %u %t %r %s %b %D %q %{User-Agent}i %T"
resolveHosts="false"/>
Apche配置：
<IfModule log_config_module>
LogFormat "%{X-Forwarded-For}i %l %u %t "%r" %>s %b "%{Referer}i" "%{User-Agent}i"" combined
LogFormat "%{X-Forwarded-For}i %l %u %t "%r" %>s %b" common
<IfModule logio_module>
LogFormat "%{X-Forwarded-For}i %l %u %t "%r" %>s %b "%{Referer}i" "%{User-Agent}i" %I %O" combinedio
</IfModule>
CustomLog "logs/access_log" common
</IfModule>