[Webkit-unassigned] [Bug 183292] New: Restrict usage of synchronous XMLHttpRequest by feature policy

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183292

            Bug ID: 183292
           Summary: Restrict usage of synchronous XMLHttpRequest by
                    feature policy
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: iclelland at chromium.org
                CC: cdumez at apple.com

XMLHttpRequest objects can have their behavior controlled by feature policy
(https://github.com/whatwg/xhr/pull/177, not merged yet)

If the policy in the active document disallows the 'sync-xhr' feature, then calling .send() on the XMLHttpRequest object should throw a NetworkError (and ideally log a message to the developer console)

Demo: https://xhr.featurepolicy.rocks/
GitHub issue: https://github.com/whatwg/xhr/issues/178
Web Platform Tests: https://wpt.fyi/xhr/xmlhttprequest-sync-default-feature-policy.sub.html

Feature policy itself has been partially implemented as part of https://bugs.webkit.org/show_bug.cgi?id=167430, but I haven't found another bug for the rest of the implementation. Let me know if I should file that as well.

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