How to disable link preview by filtering user agent

To make our on-prem One Time Secret service to work properly, without expiritng urls I implemented the following on the nginx daemon to filter out link previews request. Guess the same could be done on any HTTP service.

server {
 if ($http_user_agent !~* Gecko ) {
     return 404 ;
 }

Gecko here stands for the browser as most of the link crawlers are using unique name such as SkypeUriPreview or TwitterBot.

More agents could be finded here:

https://developers.whatismybrowser.com/useragents/explore/software_type_specific/web-browser

For examle if you want only the Chrome browser use this:

if ($http_user_agent !~ Chrome ) {
     return 444;
 }

More info how to use rewrite module could be finded here:

http://nginx.org/en/docs/http/ngx_http_rewrite_module.html#return

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