[Webkit-unassigned] [Bug 197010] New: Safari doesn't preconnect to origin when using rel="preconnect dns-prefetch"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197010

            Bug ID: 197010
           Summary: Safari doesn't preconnect to origin when using
                    rel="preconnect dns-prefetch"
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ad at andydavies.net
                CC: beidson at apple.com

Created attachment 367623

  --> https://bugs.webkit.org/attachment.cgi?id=367623&action=review

Test page with preconnect and dns-prefetch

Safari doesn't preconnect to an origin if both the preconnect and dns-prefetch hints are included in the same rel attribute e.g.

<link rel="preconnect dns-prefetch" href="https://www.wikipedia.org/">

I've used this pattern in the past as a graceful degradation for browsers that didn't support preconnect


Tests both using WebPageTest and Safari Inspector using the two attached pages - when the preconnect is successfully made a message appears in the Inspector Console

Work around is to specify the resource hints separately

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