[Webkit-unassigned] [Bug 247421] Content downloaded with fetch() API when Concent-Encoding: gzip is set is not decompressed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247421

--- Comment #12 from Ryan Reno <rreno at apple.com> ---
Forcing the web server to return Content-Type: text/plain does decompress the data on macOS.

So this looks very much like that XHR bug. The solution there was to adopt CFNetwork SPI to opt-in to auto-decompress data even if the HTTP headers aren't what the framework expects in order to trigger auto decompression.

I'm not yet sure if that's because of a CFNetwork change or a change in WebKit.

> Additionally the bug occurs on old macOS Catalina 10.15.7 (19H2) test system
> with Safari Version 14.0 (15610.1.28.1.9, 15610, released on Sep 16, 2020),
> so it does not seem like any fix from 175597 would have regressed (or if it
> did, it has regressed before Safari 14).

It seems like whatever the change may have been it did not happen very recently.

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