Bug 226382
| Summary: | Prefetching cross-origin subresources for the current page gives double fetch | ||
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| Product: | WebKit | Reporter: | Jeff Kaufman <jeff.t.kaufman> |
| Component: | New Bugs | Assignee: | Nobody <webkit-unassigned> |
| Status: | NEW | ||
| Severity: | Normal | CC: | achristensen, beidson, koivisto, webkit-bug-importer |
| Priority: | P2 | Keywords: | InRadar |
| Version: | Safari 14 | ||
| Hardware: | Mac (Intel) | ||
| OS: | macOS 11 | ||
| Bug Depends on: | 194539 | ||
| Bug Blocks: | |||
Jeff Kaufman
When a page makes a cross-origin prefetch it's not used on that page. To reproduce:
1. Turn on Develop > Experimental Features > LinkPrefetch (tested in Version 14.1)
2. Visit https://www.jefftk.com/test/prefetch/prefetch-nested
3. See that bg.css, log.js, and hello-world are immediately fetched
4. After waiting five seconds, see that they are fetched a second time (confirmed with server logs)
I tried adding "as=" attributes, without effect: https://www.jefftk.com/test/prefetch/prefetch-nested-as
It looks to me like the document is used for prefetching if I navigate to it instead of putting it in an iframe (https://www.jefftk.com/test/prefetch/prefetch-navigate). This one does make some sense: if you prefetch a document you could plausibly either want to navigate the whole page to it, or navigate an iframe. Chrome handles this the same way as Safari, while Firefox does the opposite; I've filed https://github.com/whatwg/html/issues/6723
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Radar WebKit Bug Importer
<rdar://problem/78878195>