Dear Igor,

I think you misunderstand me. Not the log output is the problem if I want to use eg. proxy_cache than I need to remove the query parameters before caching the content.

The request flow should be (so the origin server wont get any query parameters):
GET /uri?params HTTP/1.x -> nginx -> GET /uri HTTP/1.x -> origin server

More on this, is it possible to modify the request flow programmatically without internal_redirect? Like:
GET /uri?param1=value1&param2=value2 HTTP/1.x -> nginx -> GET /uri?my_param=value3 HTTP/1.x -> origin server

My temporary workaround:
location / {
root /emptydir
leki_test on;
error_page 404 = /FETCH$uri;
}
location /FETCH/ {
internal;
proxy_pass http://test/;
proxy_cache test;
proxy_cache_min_uses 1;
proxy_cache_valid 1d;
proxy_cache_methods GET HEAD;
proxy_cache_use_stale error timeout;
}

But a better solution would be like this, which does not work at the moment:
location / {
leki_test on;
proxy_pass http://test;
proxy_cache test;
proxy_cache_min_uses 1;
proxy_cache_valid 1d;
proxy_cache_methods GET HEAD;
proxy_cache_use_stale error timeout;
}

Regards,
Gabor Lekeny