Block Meta and Twitter (nginx)

blockmetatwitter.md

1. Modify /etc/nginx/nginx.conf file
2. Modify /etc/nginx/sites-available/site.conf file
3. Create /etc/nginx/useragent.rule file

Where to find user agent strings?
https://explore.whatismybrowser.com/useragents/explore/software_name/facebook-bot/

Test:

[rubin@reaper ~]$ curl -A "instagram" -I https://plrm.podcastalot.com
HTTP/2 503
server: nginx/1.18.0
date: Mon, 26 Jun 2023 06:07:25 GMT
content-type: text/html
content-length: 197

nginx.conf

http {
    .....
    include /etc/nginx/useragent.rules
}

site.conf

server {
    ....

    if ($badagent) {
        return 503;
    }

    ....
}

useragent.rules

map $http_user_agent $badagent {
        default         0;
        ~*twitter       1;
        ~*tweet         1;
        ~*facebookexternalhit      1;
        ~*facebot       1;
        ~*facebook      1;
        ~*instagram     1;
        ~*chatgpt       1;
        ~*ccbot         1;
}