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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - CFNet backend proxy detection is not very good"
href="https://bugs.webkit.org/show_bug.cgi?id=152457">152457</a>
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<th>Summary</th>
<td>CFNet backend proxy detection is not very good
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>Other
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Mac OS X 10.11
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Minor
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>WebCore Misc.
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>mcatanzaro@igalia.com
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<pre>To determine whether or not to perform DNS prefetch, the CFNet backend checks the system proxy settings once every five seconds to determine whether a proxy would be used to load <a href="http://example.com/">http://example.com/</a> or <a href="https://example.com/">https://example.com/</a>; see platform/network/DNSResolveQueue.cpp and platform/network/cf/DNSCFNet.cpp. This is not ideal, since if a proxy is configured for only a particular domain, then WebKit could perform DNS prefetch for that domain, defeating the (privacy) purpose of having selected the proxy. It would be better if it were possible to ask the system if it's possible that a proxy could be used on *any* site, and if so, disable prefetch globally. (Checking proxy settings for every prefetch is probably undesirable as that could cause a performance regression.)</pre>
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