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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [link preload] Double downloads of preloaded CSS"
href="https://bugs.webkit.org/show_bug.cgi?id=169274">169274</a>
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<th>Summary</th>
<td>[link preload] Double downloads of preloaded CSS
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>Page Loading
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>yoav@yoav.ws
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<th>CC</th>
<td>beidson@apple.com
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<pre>Following STP's exposure of preload as an experimental feature, I got a report[1] saying that we're double-downloading CSS in some cases.
Looking into that, it seems like the fact that header-based preload requests are sent out before the document's charset was determined is causing issues in matching of resources coming out of the MemoryCache (in CachedResourceLoader::determineRevalidationPolicy).
Is it possible to avoid determining the charset of resources until later on? Requiring that charset at request time is difficult for preloaded resources, unless they are deliberately delayed.
[1] <a href="https://twitter.com/voxpelli/status/834485581132480512">https://twitter.com/voxpelli/status/834485581132480512</a></pre>
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