Bizarre? Logging: $variable_* vs $upstream_http_*

[Maxim Dounin]

Hello!

On Sun, Nov 29, 2009 at 03:16:26AM -0500, icqheretic wrote:

> Consider this configuration fragment:
> 
> 
> log_format  test_log 'TEST: [$origin_ip] [$upstream_http_content_type]';
> 
> location / {
>     access_log      /tmp/test.log test_log;
>     set $origin_ip $upstream_http_content_type;
> 
>     proxy_pass             http://127.0.0.1:6060;
> }

Directive "set" executes at rewrite phase, before proxy even 
starts working.  As a result $origin_ip will be empty.

Maxim Dounin