[Webkit-unassigned] [Bug 236009] New: preload as=fetch loads json resource again during javascript fetch

Wed Feb 2 02:55:56 PST 2022

https://bugs.webkit.org/show_bug.cgi?id=236009

            Bug ID: 236009
           Summary: preload as=fetch loads json resource again during
                    javascript fetch
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tobias at tangemann.org
                CC: beidson at apple.com

Safari 15.3 (17612.4.9.1.5) on MacOS loads the resource specified in the preload and again with fetch in the javascript code.
XMLHttpRequest also loads the resource again not using the preloaded data.

Minimal example:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Preload-Test</title>
    <meta charset="utf-8">
    <link rel="preload" href="data.json" as="fetch" type="application/json" crossorigin>
</head><body>
    <script>
        fetch('data.json',
            {
                credentials: 'same-origin',
                mode: 'cors'
            }).then(res => console.log(res));
    </script>
</body></html>

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