Hi all, I just updated my configuration files as following

location ~ \.php$ {
try_files $uri =404;
if ($arg_mod = "upload" ) {
return 485;
break;
}
if ($request_method = POST){
return 484;
break;
}
error_page 484 = @post;
error_page 485 = @flash;
fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
include fastcgi_params;
fastcgi_pass backend;
}
location @post{
internal;
access_log /web/log/post.log plog;
try_files $uri =404;
fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
include fastcgi_params;
fastcgi_pass backend;
}
location @flash{
internal;
access_log /web/log/flash.log main;
try_files $uri =404;
fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
include fastcgi_params;
fastcgi_pass backend;
}


I'm using if to check whether user want to upload a file or not.

But I know that if is evil, so how can achieve the same result without using if?