[Webkit-unassigned] [Bug 247421] New: 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

            Bug ID: 247421
           Summary: Content downloaded with fetch() API when
                    Concent-Encoding: gzip is set is not decompressed
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jujjyl at gmail.com
                CC: beidson at apple.com

Safari browser does not decompress gzip-compressed content downloaded with fetch() even though Content-Encoding: gzip is instructed on the content by the web server.

On other browsers (Firefox, Chrome), this works properly.

STR:

1. Download attached fetch_test.tgz and unzip it.
2. Navigate in console to the uncompressed directory, and run "python3 emrun.py --no_browser --port 8000 ."

This step will launch an ad hoc web server to listen at address http://localhost:8000/ . This is based on the regular ad hoc python3 web server, except that the server has been augmented to specify "Content-Encoding: gzip" on the served test.data.gz file.

3. Navigate to http://localhost:8000/test.html

4. Open the page web console, and observe the logs printed there, and the final test result that appears on the page body.

Observed:

On Safari, the browser will print (among other things)

  [Warning] Downloaded an ArrayBuffer of size 25098 bytes (test.html, line 10)
  [Warning] Fetch Response headers: (test.html, line 11)
  [Log] content-encoding: gzip (test.html, line 13)
  [Log] content-length: 25098 (test.html, line 13)

and the page body will report

  Test ERROR: Received gzip-compressed data, but browser should have decompressed it

Expected:

On Chrome and Firefox, the browser will print

  Downloaded an ArrayBuffer of size 93274 bytes
  Fetch Response headers:
  content-encoding: gzip
  content-length: 25098

and the page body will report

  Test passed OK

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