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Who cares about TTFB?! Not me. It says nothing about how fast a page is loaded and displayed. Do you get better results as cachecrawler.com? I don't think so! Get rid of the idea that every CMS has to be bloated. I use custom code for my CMS and only load what is actually necessary for display...

TTFB depends on user and closest CDN node location, so it is not fix for every request. When I do a PageSpeed test, no bad TTFB is reported.

Yes, but QUIC needs HTTP/3 and HTTP/3 needs TCP.

TCP has nothing to do with protocol version, because TCP is the underlying transport protocol used by HTTP, meaning TCP is always used. And there is no initial connection type. Either HTTP/3 is used or not, so I think you need to learn some basic knowledge what is what and what is used for what.

Normally, you don't have to worry about whether HTTP/3 or QUIC is used because all modern browsers support QUIC. However, you must ensure that the connection is made via SSL or https, QUIC is activated in LiteSpeed WebAdmin, port 443 is used for https and the UDP port 443 for incoming and...

It is not about the session, but the request and the request decides what HTTP parameters are used. With curl you can simulate if your code works.

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/