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Dear all:

When I use this variable in log_format directive ,it can print the request_body in the log file

but somewhere else it can't!

if i use the $request_body at log_format and somewhere else( such as "proxy_pass") at the same time .there is no output in the log file!

http{

log_format main '$remote_addr - $remote_user [$time_local] $request '
'"$status" $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for" "$request_body"';


server {
listen 80;
server_name my.test.com;
root /opt/test;
include vhost/alias.conf;
include vhost/proxy.conf;
if (-d $request_filename) {
rewrite ^/(.*)([^/])$ http://$host/$1$2/ permanent;
}
set $mytest $request_body;
log_format test '$remote_addr - $remote_user [$time_local] $request '
'"$status" $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for" "$mytest"';
location / {
root /opt/test;
index index.html index.htm;
}
error_log /usr/local/nginx/logs/my_error.log;
access_log /usr/local/nginx/logs/my_access.log main;
include vhost/prox.conf;
}
}
}


My Nginx Version is
nginx version: nginx/0.8.15
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