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As said, use server variables or curl. Both will give you what you need.

There is no session and you don't need any session data, because server variables and the protocol version used depends on user request. Alt-Svc is a response header, but the values of Alt-Svc header depends on what is supported by the browser.

phpinfo() does the trick. ;) $_SERVER['X_SPDY'] // HTTP3 $_SERVER['SSL_PROTOCOL'] // QUIC $_SERVER['SERVER_PROTOCOL'] or use curl to get Alt-Svc response header.

Please read before you post.... https://www.litespeedtech.com/support/forum/threads/please-use-the-official-wordpress-forum.16028/

Reading before posting is the fastest help ever. ;) https://www.litespeedtech.com/support/forum/threads/please-use-the-official-wordpress-forum.16028/

Please read this: https://www.litespeedtech.com/support/forum/threads/please-use-the-official-wordpress-forum.16028/

It seems that you are using OpenLiteSpeed instead of LiteSpeed Enterprise, right?

Support at WordPress ask you to raise a ticket at support@litespeedtech.com and not to open a support thread at this forum!

https://www.litespeedtech.com/support/forum/threads/please-use-the-official-wordpress-forum.16028/

Is this question WordPress related?

No.

This is the crucial sentence! If the cache function cannot be deactivated so that you can only use the CDN as a proxy without a cache, then you can no longer use the Hostinger CDN because the CDN cache is the mother of all problems if a page cache is also used on the origin. Deactivate the...

As you can read in the documentation on 503, 503 errors are PHP related or are caused by PHP malfunctions. If there was an error in LiteSpeed, it would not trigger a 503 error. You must therefore check the relevant error log files to find out the cause. Your host provider should know what to do...

https://www.litespeedtech.com/support/forum/threads/please-use-the-official-wordpress-forum.16028/

LiteSpeed has made numerous improvements with version 6.3. However, LiteSpeed or their external employees who actually program the cache plugin for WordPress seem to ignore the many bugs in this plugin. Why add new features if the faulty functions of the last 5 years are not fixed, let alone...

https://docs.litespeedtech.com/lsws/extapp/php/troubleshooting/503/

However, you are encouraging other users to install even more plugins. It may be convenient to be able to solve a problem with a plugin, but as already mentioned, every additional plugin creates new problems that would not have existed without the additional plugin being installed. A lot of...

You don't need an extra plugin for every little thing. Every additional plugin just makes your site slower. Apache and LiteSpeed provide you with everything you need with just a few lines of code.

Yes, disable CDN cache in every case.

You can use the CDN for proxy usage, but not the CDN cache, because 1 cache (LiteSpeed) plus 1 cache (Hostinger) is not 2 cache! If you use both cache at a time you always serve outdated content because the cache of both is not synchronized and this is the reason why you can't purge the cache at...