312221 2026-04-13 19:01:00 -0700 Disable "SpeculationRules prefetch" feature due to regressions 2026-04-13 21:53:30 -0700 1 1 1 Unclassified WebKit Page Loading WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 cdumez cdumez achristensen beidson webkit-bug-importer yoav oldest_to_newest 2199995 0 cdumez 2026-04-13 19:01:00 -0700 On onemileatatime.com, clicking links loads blank pages. It looks like the prefetches result in 503 status code responses which are being cached and reused for those navigations. 2199996 1 cdumez 2026-04-13 19:01:37 -0700 rdar://173956448 2199997 2 479055 cdumez 2026-04-13 19:02:10 -0700 Created attachment 479055 Potential fix (untested) 2200000 3 cdumez 2026-04-13 19:05:07 -0700 Pull request: https://github.com/WebKit/WebKit/pull/62695 2200052 4 ews-feeder 2026-04-13 21:53:27 -0700 Committed 311166@main (186d42fe95a9): <https://commits.webkit.org/311166@main> Reviewed commits have been landed. Closing PR #62695 and removing active labels. 479055 2026-04-13 19:02:10 -0700 2026-04-13 19:02:10 -0700 Potential fix (untested) speculationRules_fix.patch text/plain 2089 cdumez ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJDb3JlL2xvYWRlci9Eb2N1bWVudFByZWZldGNoZXIuY3Bw IGIvU291cmNlL1dlYkNvcmUvbG9hZGVyL0RvY3VtZW50UHJlZmV0Y2hlci5jcHAKaW5kZXggZTI1 MDljYTVjMWY0Li40ODE0MTg4ODkyNzIgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJDb3JlL2xvYWRl ci9Eb2N1bWVudFByZWZldGNoZXIuY3BwCisrKyBiL1NvdXJjZS9XZWJDb3JlL2xvYWRlci9Eb2N1 bWVudFByZWZldGNoZXIuY3BwCkBAIC0xNjIsOCArMTYyLDEwIEBAIHZvaWQgRG9jdW1lbnRQcmVm ZXRjaGVyOjpwcmVmZXRjaChjb25zdCBVUkwmIHVybCwgY29uc3QgVmVjdG9yPFN0cmluZz4mIHRh Z3MsIHN0CiAgICAgcHJlZmV0Y2hlZFJlc291cmNlLT5hZGRDbGllbnQoKnRoaXMpOwogfQogCi12 b2lkIERvY3VtZW50UHJlZmV0Y2hlcjo6cmVzcG9uc2VSZWNlaXZlZChjb25zdCBDYWNoZWRSZXNv dXJjZSYsIGNvbnN0IFJlc291cmNlUmVzcG9uc2UmLCBDb21wbGV0aW9uSGFuZGxlcjx2b2lkKCk+ JiYgY29tcGxldGlvbkhhbmRsZXIpCit2b2lkIERvY3VtZW50UHJlZmV0Y2hlcjo6cmVzcG9uc2VS ZWNlaXZlZChjb25zdCBDYWNoZWRSZXNvdXJjZSYgcmVzb3VyY2UsIGNvbnN0IFJlc291cmNlUmVz cG9uc2UmIHJlc3BvbnNlLCBDb21wbGV0aW9uSGFuZGxlcjx2b2lkKCk+JiYgY29tcGxldGlvbkhh bmRsZXIpCiB7CisgICAgaWYgKCFyZXNwb25zZS5pc1N1Y2Nlc3NmdWwoKSkKKyAgICAgICAgcmVt b3ZlUHJlZmV0Y2gocmVzb3VyY2UudXJsKCkpOwogICAgIGlmIChjb21wbGV0aW9uSGFuZGxlcikK ICAgICAgICAgY29tcGxldGlvbkhhbmRsZXIoKTsKIH0KZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJD b3JlL2xvYWRlci9jYWNoZS9DYWNoZWRSZXNvdXJjZUxvYWRlci5jcHAgYi9Tb3VyY2UvV2ViQ29y ZS9sb2FkZXIvY2FjaGUvQ2FjaGVkUmVzb3VyY2VMb2FkZXIuY3BwCmluZGV4IDAxNDY2ZGFlMGY0 My4uM2MzNDM0MTVmODExIDEwMDY0NAotLS0gYS9Tb3VyY2UvV2ViQ29yZS9sb2FkZXIvY2FjaGUv Q2FjaGVkUmVzb3VyY2VMb2FkZXIuY3BwCisrKyBiL1NvdXJjZS9XZWJDb3JlL2xvYWRlci9jYWNo ZS9DYWNoZWRSZXNvdXJjZUxvYWRlci5jcHAKQEAgLTE1MzUsNiArMTUzNSwxNCBAQCBDYWNoZWRS ZXNvdXJjZUxvYWRlcjo6UmV2YWxpZGF0aW9uUG9saWN5IENhY2hlZFJlc291cmNlTG9hZGVyOjpk ZXRlcm1pbmVSZXZhbGlkYQogCiAgICAgYXV0byBjYWNoZVBvbGljeSA9IHRoaXMtPmNhY2hlUG9s aWN5KHR5cGUsIHJlcXVlc3QudXJsKCkpOwogCisgICAgLy8gRG9uJ3QgcmV1c2UgcHJlZmV0Y2hl ZCByZXNvdXJjZXMgdGhhdCByZWNlaXZlZCBlcnJvciByZXNwb25zZXMuCisgICAgaWYgKGV4aXN0 aW5nUmVzb3VyY2UtPm9wdGlvbnMoKS5jYWNoaW5nUG9saWN5ID09IENhY2hpbmdQb2xpY3k6OkFs bG93Q2FjaGluZ01haW5SZXNvdXJjZVByZWZldGNoCisgICAgICAgICYmICFleGlzdGluZ1Jlc291 cmNlLT5yZXNwb25zZSgpLmlzTnVsbCgpCisgICAgICAgICYmICFleGlzdGluZ1Jlc291cmNlLT5y ZXNwb25zZSgpLmlzU3VjY2Vzc2Z1bCgpKSB7CisgICAgICAgIExPRyhSZXNvdXJjZUxvYWRpbmcs ICJDYWNoZWRSZXNvdXJjZUxvYWRlcjo6ZGV0ZXJtaW5lUmV2YWxpZGF0aW9uUG9saWN5IHJlbG9h ZGluZyBkdWUgdG8gdW5zdWNjZXNzZnVsIHByZWZldGNoIHJlc3BvbnNlLiIpOworICAgICAgICBy ZXR1cm4gUmVsb2FkOworICAgIH0KKwogICAgIC8vIFZhbGlkYXRlIHRoZSByZWRpcmVjdCBjaGFp bi4KICAgICBib29sIGNhY2hlUG9saWN5SXNIaXN0b3J5QnVmZmVyID0gY2FjaGVQb2xpY3kgPT0g Q2FjaGVQb2xpY3k6Okhpc3RvcnlCdWZmZXIgfHwgZXhpc3RpbmdSZXNvdXJjZS0+b3B0aW9ucygp LmNhY2hpbmdQb2xpY3kgPT0gQ2FjaGluZ1BvbGljeTo6QWxsb3dDYWNoaW5nTWFpblJlc291cmNl UHJlZmV0Y2g7CiAgICAgaWYgKCFleGlzdGluZ1Jlc291cmNlLT5yZWRpcmVjdENoYWluQWxsb3dz UmV1c2UoY2FjaGVQb2xpY3lJc0hpc3RvcnlCdWZmZXIgPyBSZXVzZUV4cGlyZWRSZWRpcmVjdGlv biA6IERvTm90UmV1c2VFeHBpcmVkUmVkaXJlY3Rpb24pKSB7Cg==