[Webkit-unassigned] [Bug 187173] New: Preload headers not loading assets assets on parse

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187173

            Bug ID: 187173
           Summary: Preload headers not loading assets assets on parse
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: unknown9595 at hotmail.com
                CC: beidson at apple.com

Created attachment 343903

  --> https://bugs.webkit.org/attachment.cgi?id=343903&action=review

The JS CSS should be loaded at the beginning of the waterfall

Steps to reproduce the problem:
1. Open Network inspector
2. I created a demo page, which flushes the preload headers, then adds a delay, then flushes the rest of the page
Go to https://glitch.com/edit/#!/thunder-tune > Show Live
3. The waterfall shows assets loaded when the HTML is fully downloaded

What is the expected behavior?
Assets should be downloaded as soon as the Preload headers are parsed. This happens regardless of if GZIPed (Comment back in compression in demo to enable GZIP).

What went wrong?
Assets are loaded once the HTML has been parsed, not when the preload headers are parsed.

Did this work before? N/A 

Does this work in other browsers? No

Not sure if this is an Express/Node issue or a browser issue, but if I curl the demo I can see the preload headers > delay > rest of HTML so content is being sent to the browser.
Have filed a Chrome issue as well, but it only affects Chrome when GZIPed.

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