How to defeat a circular redirect?

Question

PHP

Good afternoon.
When adding a site to Yandex.Webmaster, it returns the response "The site is performing a circular redirect."
Yandex answer:

When Yandex robots access the main page of your site, the server responds with a 302 redirect code to the same page, i.e. a circular redirect is obtained, for this reason the rights cannot be confirmed. I recommend that you check your server settings.
You need to configure the server in such a way that it responds to our robots with the code 200. Then the rights to the site in Yandex.Webmaster should be confirmed successfully.
If you have any difficulties with setting up the server, please contact your hosting provider's support service.

Host response:

Hello!
There are no settings that redirect the site from the server side. To resolve the situation, we recommend that you contact the developer of your site.

Through trial and error, I found a problem in this piece of code

if(!$city_id) $city_id = 4400;
      }
      
      setcookie('fields_city_id', $city_id, time()+86400, '/', null, false, false);
      
      $controller->redirect('http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
      
    }

What's wrong here?
And how to overcome?

Answer 1

What's wrong here?

By the way, the redirect occurs if the client does not have the fields_city_id cookie, but the problem is that the bot does not accept cookies, which is why the page is endlessly redirected to itself.
remove dependence on cookies, why redirect at all, for the sake of setting one cookie? Wouldn't it be easier to remove the redirect and just paste it after

setcookie('fields_city_id', $city_id, time()+86400, '/', null, false, false);

line
, and then the redirect is not needed, and the cookie is set, and it immediately lies in the global array.

Answer 2

Do you know what a redirect is?
so the site redirects endlessly

Answer 3

This is when you redirect to some page, and that page redirects back to you.

Answer 4

Check the settings in particular of the CMS itself, if it is on the CMS, if not, check where you have the main site mirror for example from www, and in your .htaccess settings it is indicated not to use www and redirect.