Incompatibility between ABP and uBO over FETCH (json)

[k2jp]

Thank you for maintaining uBO!

Read first: https://github.com/gorhill/uBlock/blob/master/CONTRIBUTING.md

done

Describe the issue

FETCH requests are blocked after |http:$ping is added.

One or more specific URLs where the issue occurs

http://www.compareyourcountry.org/pisa/?lg=en (JavaScript is required)

Screenshot in which the issue can be seen

BEFORE |http:$ping is added
↑ FETCH (json)

AFTER |http:$ping is added
↑ other (blocked)

↑ $xmlhttprequest (not blocked)

Steps for anyone to reproduce the issue

1. Install and Disable uBlock Origin 1.10.0 and Adblock Plus 2.8.2.
2. Open http://www.compareyourcountry.org/pisa/?lg=en
3. Use Firefox 50.0.2 build-in developer tools via Web Developer → Network and confirm that /maps.js? requests belong to FETCH (json) after you reload the page.
4. Enable uBlock Origin and add |http:$ping.
5. Open the Logger and reload the page.
6. Confirm that /maps.js? requests belong to other and are blocked. This result is unexpected for me.
7. Disable uBlock Origin
8. Enable Adblock Plus and add |http:$ping.
9. Open Blockable Items and reload the page.
10. Confirm that /maps.js? requests belong to xmlhttprequest and are NOT blocked.

• You notice that...

  • uBlock Origin interprets |http:$ping as |http:$other.
  • uBlock Origin treats FETCH as other.
    These deference causes incompatibility.

• Note: I know that uBlock Origin has a setting "Disable hyperlink auditing/beacon" and $ping filter option is dispensable. However, it would be nice if this incompatibility is fixed!

Your settings

• OS: Windows
• Browser: Cyberfox 50.0.2 (Firefox 50.0.2 compatible) JavaScript enabled
• uBlock Origin 1.10.0
• Adblock Plus 2.8.2

Your filter lists

This issue is not depend on specific filter lists.

Your custom filters (if any)

|http:$ping

[gorhill]

uBO will map Firefox's TYPE_FETCH to xmlhttprequest (xhr in logger), that is a quick fix. uBO 1.10.1rc1 on AMO has that fix.

The other part, support for ping filter, I will implement it eventually.

[k2jp]

Confirmed the fix. Many thanks!

Support for ping

Understood.

[k2jp]

Reopened for the ping support.

[gorhill]

Actually, there is already an issue for ping, I reopened this one as the substance of the issue here was missing mapping between TYPE_FETCH and xmlhttprequest in Firefox.

[k2jp]

Understood.
Thanks for the explanation.