[Webkit-unassigned] [Bug 50996] New: Consider disabling DNS prefetch when proxy is used

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50996

           Summary: Consider disabling DNS prefetch when proxy is used
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Page Loading
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ap at webkit.org


DNS prefetching increases load on proxies, confuses certain enterprise security systems, and possibly even causes pages load failures due to overwhelming proxies.

Benefit from DNS prefetch is limited with SOCKSv5 or HTTP proxies, because WebKit will talk to a proxy server, and not to the actual host (I believe that names are still resolved on the client with SOCKSv4). When inside a corporate network, DNS may well return incorrect results, poisoning client DNS cache due to DNS prefetch.

See also: <https://bugzilla.mozilla.org/show_bug.cgi?id=507578>.

<rdar://problem/8098862>

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