How to reject URL requests in nginx that contain a get method?

Question

Nginx

The task is to reject all requests for a specific url.
url next - "/blablabla/bla?x=55&y=="
​​Everything seems to be simple, I create a location and deny all:
location = /blablabla/bla?x=55&y== {deny all;}
Then I check with curl:
curl -I ' localhost/blablabla/bla?x=55&y== '
I get 404, although I should get 403.
Also, if I put return 200 instead of deny all, I still get 404.

I know that I can do this:
location ~ /blablabla/bla {
if ( $args ~ ^x=55&y== ) { return 403; }
}
But at high loads, the conditional statement can take a lot of CPU.

Maybe I'm wrong in the syntax?
Or the only option is the second method?

Thanks for the help.

Answer 1

Second method. query parameters never match in location.
> But at high loads, the conditional statement can take a lot of CPU.
I strongly doubt that you have such high loads that it would be noticeable.
Well, in if, you can use a simple comparison, not a regular expression.