How to disable logging for urls that contain the word _ajax?

Question

Nginx

There are different urls like

/some/path/one/_ajax?_=1484114768232
/some/path/two/_ajax
/path/3/_ajax?_=1484114768111
/some/path/two/_ajax/
и т.д.

All of them contain the word "_ajax".
How to turn off logs for all URLs containing it?
Tried like this:

location ~* (_ajax)$ {
                access_log   off;
        }

The logs stop, but at the same time, js scripts that use ajax break.

Answer 1

map $request_uri $loggable {
    ~_ajax  0;
    default 1;
}

access_log /path/to/access.log combined if=$loggable;

a similar case is in the documentation, at the end of the description of the access_log directive