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I am sorry that a solution for this issue can only be provided by commercial soluton, but this forum doesn't allow it.

CloudFlare and every other CDN provider transmits the real client IP address. If your host is requested this means it is requested by a user and not by CloudFlare. Therefore you can't filter or block requests by CF because CF doesn't request your site. It is the user that requests it and not...

...but causes higher load to prevent blocking requests in that way... OLS is a web server and not a firewall and every block causes extra load.

The problem you describe is a well-known problem that many experts have already racked their brains over. There is a solution to this problem, but it is not an OLS problem because OLS is just a web server. That is why you cannot expect a web server to solve a problem that requires other...

Why do you need canonical URLs for PDF documents? Google is smart enough to recognize PDF documents.

Try this. Not tested, but should work: <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{REQUEST_FILENAME} -f RewriteCond %{REQUEST_URI} \.pdf$ [NC] RewriteRule .* - [E=CANONICAL_URL:%{REQUEST_SCHEME}://%{HTTP_HOST}%{REQUEST_URI}] </IfModule> <IfModule mod_headers.c>...

No, it is not about headers but the rewrite rules for cache vary. No, it is not possible. I have invested a lot of time in the past few years to validate bugs and whenever I have reported these bugs, the reports have either been ignored or I have been spoken to in a stupid way or even...

@hp2 @Cold-Egg will not know any answer and he will redirect you the plugin support at WordPress forum, but don't hope you will get any qualified answer since I have reported this bug many times in the last years.

The problems mentioned exist from day one up to the current version.

@hp2

@swapot I'm glad that you've learned something from this discussion and you can now hopefully evaluate for yourself whether a CDN is beneficial to you. But there are still tons of insights to be gained to delve deeper into the subject of CDN: "Big Deal or Big Fake?" If you need further...

There is no need to create a rule to bypass caching if you don't enable caching. Using CF Cache + LiteSpeed Cache and LiteSpeed Optimizations at the same time is an absolute no-go! Don't use CF caching and LScache at the same time, because it causes much conflicts! But you can still use CF Cache...

You are using an outdated Firefox version.

@swapot The article from https://acnam.com/untold-truths-of-cloudflare-cdn/ is very good and also confirms my tests with CloudFlare. Even if you now understand more thanks to these two articles, it does not make using a CDN any easier, as the seemingly uncontrollable routing makes a CDN a...

You have already answered this question yourself. In order for a CDN to be faster than without a CDN, the content of a URL must already be cached. Normally, this is rarely the case, which means that an additional layer is created by the CDN, which makes a CDN slower than without a CDN. After...

Regardless of whether it is quic.cloud or any other CDN, improved speed requires that the content of a URL be cached in a CDN node, which is rarely the case. If the content is not cached, which is the typical case, then a CDN creates an additional layer, which slows down the network time. With...

Thank you for allowing me to help you selflessly, even though the answer is not what you expected.

In short, use optimization features of the LScache plugin, but forget whatever CDN. You don't a CDN to benefit from optimizations. Also CloudFlare optimizations conflict with LScache plugin.

In this case a CDN doesn't make much sense, meaning you have no advantage of a CDN and the CDN is slower as without CDN.

The most important question is, do you have more international visitors on your site than from your own country?