What is the working mechanism of nginx + php-fpm?

Question

PHP

I noticed when using file_get_contents, curl, get_headers and some others that nginx behaves strangely.
The script is called twice.
For example:
file_get_contents(' example.com ');
exec('wget example.com > /tmp/');
As a result, 2 files ...
This is not observed on Apache.
Worker processes in the nginx 4 config, running from the user.
Suspicions fall on accelerated upload in php-fpm, but still, I still don’t understand where to look for the reason.

Answer 1

if you're testing everything in the browser, and you've configured to redirect to php-fpm all requests for which no files were found, then most likely the second request is caused by the browser when it wants to get a favicon.
In general, bring the nginx config and make sure that the browser does not make two requests to the server (in the debug panel).