Attachment of wiki page cannot be deleted on older versions of Firefox

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.X, Master
• Fix Version/s: 7.0.0 DXP FP66, 7.0.X, 7.1.10 DXP FP4, 7.1.10.1 SP1, 7.1.2 CE GA3, 7.1.X, Master
• Component/s: Collaboration > Wiki
• Labels:
  • ee-ts
  • liferay-dxp-70-sp10
  • liferay-dxp-71-sp1
  • liferay-fixpack-de-66-7010
  • liferay-fixpack-dxp-4-7110
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Story Points: 0.25
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/64672

In older versions of Firefox (like ESR 60.*), the fetch() JS function will not send CSRF tokens by default, leading the request to fail.

The issue is fixed on newer versions of Firefox, like 63.*.

Steps to reproduce:

1. Use Firefox ESR 60.*
2. Add a Wiki portlet to the page.
3. Click All Pages tab.
4. Click Add page button of the portlet. Add a wiki page.
5. Upload a image to the new added wiki page.
6. Edit the page again and click Move to Recycle Bin button of the attachment.
7. Click Publish button.
8. Check the wiki page.

Except Result:
Attachment file deleted,

Actual Result:
Attachment file is not deleted.