Get rid of args from $request_uri

[chilly_bang]

Hi

I want to build a construction like

location ~*     {
if ($args ~ *)      {
add_header Link "<$scheme://$http_host$request_uri>; rel=\"canonical\"";
}
}
but need to get rid of argues from $request_uri. The goal is from any url
with parameters to point with canonical auf non-parameter url counterpart.
I've realized a method to get rid of argues from $request_uri, like this:

map $request_uri $request_uri_path {
  "~^(?P<path>[^?]*)(\?.*)?$"  $path;
}

I Need an advice - how are both snippets to put together?

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,275930,275930#msg-275930