Does nginx create a separate tcp connection to an internal location?

Question

Nginx

Good day.
How it works:
1) The user accesses server 1 on server_name1/location1
2) It has a proxy_pass on upstream, server 2 from which sends a 302 redirect to another server_name2/location2 of server 1
3) We catch it (error_page 301 302 = @redirect; ) and send the content using the link obtained in step 2
Everything is transparent for the user, the url does not change.
In this case, nginx makes an http request to itself in step 3: server_name1/location1 -> server_name2/location2
The question is:
How does nginx access the internal location? With the creation of an additional tcp connection to itself or through internal mechanisms?
I would like to make a subrequest in server_name1/location1 to a third-party server 2, get a link and immediately make a proxy_pass for it

Answer 1

Thanks everyone, everything was decided by rewrite to lua and transferring server_name2/location2 to server_name1/@redirect

Answer 2

It's not nginx that's calling, it's the client that got the 302. Look at the logs, you can turn on the redirect trace there.

Answer 3

Nihera is not clear, the terms themselves came up with. Give me config.
If nginx sees rewrite (redirect) then it just starts matching location from your config again but for a new url.
nginx.org/en/docs/http/ngx_http_rewrite_module.htm...