[Webkit-unassigned] [Bug 204665] New: sendBeacon on Safari 13 seeing high failure rates

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204665

            Bug ID: 204665
           Summary: sendBeacon on Safari 13 seeing high failure rates
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yoav at yoav.ws

I've been getting multiple reports that `sendBeacon` on Safari 13 (both on iOS and macOS) is seeing significantly more failure reports than previous versions.
One provider that was measuring click based beacons was seeing 5x increase in failures, resulting in 1% of failures. A publishing platform that was using it to report back performance measurements was seeing a similar failure.
Talking to both, they are falling back to using sync XHR in Safari, which seems like a step in the wrong direction.

On top of that Simon Hearne at perf.now()[1] mentioned that as an analytics provider, he is seeing significantly slower unload times on iOS than on other platforms. That can be an indication that many folks use syncXHR instead of beacon there.


[1] https://perfnow.nl/

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