Nginx map: regex to check substring

Question

I have a Nginx service that serves an application. This application sends requests often, because of that, there are a lot of log messages inside my access.log file.

For that reason, I'm trying to create a Conditional Logging to avoid to save these unnecessary log messages.

Based on the documentation, I've tried to create a regex to check if the request contains a substring, but it did not work.

I believe my $request variable should be a request like this one:

GET /catalog-dash/_reload-hash HTTP/1.1

I would like to check if my $request variable contains the _reload-hash substring.

I've created the code below, but it did not work, unfortunately.

map $request $loggable {
    ~/_reload-hash/  0;
    default 1;
}

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

If someone could help me, I would appreciate it.

Thank you in advance.

You're trying to match a string that ends with a /. The example you give in your question does not. Also, If you are not interested in the GET and HTTP/1.1 bits, you could use $request_uri instead. — Richard Smith
– Richard Smith, Commented Apr 7, 2020 at 14:43
Thank you for your observation. I've changed my configuration. — rmmariano
– rmmariano, Commented Apr 7, 2020 at 15:07

rmmariano · Accepted Answer · 2020-04-07 15:14:02Z

1

I believe before asking the question I did not use the correct keys to search the answer on the internet.

Some minutes after asking the original question I've found this answer that has solved my problem.

I send below the changes I did to work and I hope it could help others in the future.

map $request_uri $loggable {
    ~^.*_reload-hash.*$  0;
    default 1;
}

Thank you Richard for your tip of using $request_uri instead of $request.

answered Apr 7, 2020 at 15:14

rmmariano

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