Use redirection resources in 'prevent-xhr' scriptlet

[piquark6046]

Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

They checks that google-adsense or googlesyndication exists in XMLHttpRequest.prototype.responseText via jQuery.ajax.done.
It can be resolved if a filters list maintainer can use redirection resources in 'prevent-xhr' scriptlet.

• https://piquark6046.github.io/testpage/XMLResponse-aagag/20230810/
• aagag.com AdguardTeam/AdguardFilters#158625
• aagag.com List-KR/List-KR#769

A specific URL where the issue occurs.

https://aagag.com/issue/?idx=1275471

Steps to Reproduce

Pleas visit the website.
If you use List-KR filters list or uAssets filters lists, please apply the following filters:

@@||pagead2.googlesyndication.com/pagead/js/adsbygoogle.js$xhr,from=aagag.com,badfilter
||pagead2.googlesyndication.com/pagead/js/adsbygoogle.js$xhr,redirect-rule=googlesyndication_adsbygoogle.js:5,from=~zipextractor.app,badfilter
||pagead2.googlesyndication.com^$xhr,redirect-rule=noop.js,badfilter

Expected behavior

XMLHttpRequest.prototype.responseText (jQuery.ajax.done) returns googlesyndication_adsbygoogle.js redirection resource.

Actual behavior

XMLHttpRequest.prototype.responseText (jQuery.ajax.done) returns empty text.

uBO version

1.51.0

Browser name and version

Mozilla Firefox Developer Edition 117.0b5

Operating System and version

Ubuntu 23.04

[gorhill]

I want to understand why you would want to use prevent-xhr instead of using redirect filter option?

[piquark6046]

For AdGuard filters list compatibility.
In AdGuard for iOS, $redirect filter option cannot be used if you want to block an anti-adblock script using XMLHttpRequest, element source loading with onerror listeners or fetch.

[gorhill]

Meant to use the issue here as reference in commit message: gorhill/uBlock@bf591d93fb

[stephenhawk8054]

@gorhill Not sure if I should open another issue, but can this be done with fetch too?

---

Linking with this discussion uBlockOrigin/uAssets@cf9f577 about redirect not work well with Firefox in fetch case as it's hard to search back comments in commits.

For cases that redirect can't work in Firefox, no-fetch-if with war would be helpful.

[gorhill]

There is already an issue opened for this: #2526.

[stephenhawk8054]

Ah right sorry, I misread the title of that issue and overlooked it.