RESOLVED FIXED306605
Speculation Rules JSON with no charset is not processed 
https://bugs.webkit.org/show_bug.cgi?id=306605
Summary Speculation Rules JSON with no charset is not processed
Yoav Weiss
Reported 2026-01-30 00:46:38 PST
Going to https://theme-horizon-demo.myshopify.com/, its speculation rules JSON doesn't explicitly state its charset in its Content-Type header. As a result, the speculation rules are not processed, and an "[Error] Invalid speculation rules encoding https://theme-horizon-demo.myshopify.com/cdn/shopifycloud/storefront/assets/storefront/horizon.immediate.specrules-17895942.json" console error is emitted. This is contrary to the spec that indicates that such resources should be parsed as UTF-8.
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Yoav Weiss
Comment 1 2026-01-30 00:54:14 PST
Pull request: https://github.com/WebKit/WebKit/pull/57541
EWS
Comment 2 2026-01-30 12:13:32 PST
Committed 306513@main (9b44ce96b044): <https://commits.webkit.org/306513@main> Reviewed commits have been landed. Closing PR #57541 and removing active labels.
Radar WebKit Bug Importer
Comment 3 2026-01-30 12:14:13 PST
<rdar://problem/169297139>
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