filters.adtidy.org returns HTTP 200 even when If-None-Match matches server ETag

[SukkaW]

Prerequisites

• This problem is not related to filtering issues. Otherwise, you should read this article;
• You're using an up-to-date version of the problematic filter;

Problem description

I regularly fetch AdGuard's filter from filters.adtidy.org. To avoid overloading AdGuard's server/CDN, I've implemented a cache based on ETag. However, I've noticed that filters.adtidy.org sometimes returns HTTP 200 instead of HTTP 304, even when the returned ETag matches the sent If-None-Match:

This behavior cannot be reproduced consistently, though:

Proposed solution

Check the implementation of AdGuard's registry server and the CDN provider (CDN77) to make sure always returns HTTP 304 when the server ETag matches If-None-Match.

Privacy

• I agree to follow this condition

[Alex-302]

@SukkaW But

To avoid overloading AdGuard's server/CDN, I've implemented a cache based on ETag

Do you have many clients? One user usually is not a problem for servers)
Also our filters support diff-update
https://filters.adtidy.org/extension/chromium/patches/18/18-s-1729265794-3600.patch
AdguardTeam/FiltersCompiler#192

[D13410N3]

Hello.
Unfortunately it is not possible right now due to some filters update implementation reasons.