Facebook requires https protocol on the site. You cannot request authorization if your site does not use Https.
In addition to the changes on the site, you need to reconfigure facebook applications.
Change authorization paths to https and add your site with https protocol to trusted url.
Remember that Http and HTTPS are not just different letters, they are also different domains and, as a result, websites.
Typically they close the ability to access social networks and, most importantly, they close the ability to access the server for social networks.
The social network, in other words, turns to Slogin...
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