[Webkit-unassigned] [Bug 254010] New: Fetch POST Requests Not Working on Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=254010

            Bug ID: 254010
           Summary: Fetch POST Requests Not Working on Safari
           Product: WebKit
           Version: Safari 16
          Hardware: All
                OS: iOS 16
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pranayyadav08 at gmail.com

It seems that fetch is not working properly on both ARM and x86 machines, resulting in request bodies not being sent to the intended URL, despite using various code examples and workarounds. The expected request format should look like
"POST / HTTP/1.1\r\nHost: localhost:53421\r\nContent-Type: application/json\r\nOrigin: http://localhost:53421\r\nAccept-Encoding: gzip, deflate\r\nConnection: keep-alive\r\nAccept: application/json\r\nUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.3 Safari/605.1.15\r\nReferer: http://localhost:53421/\r\nContent-Length: 22\r\nAccept-Language: en-US,en;q=0.9\r\n\r\n{\"get_response\": true}"
but the actual request sent is missing the JSON body
"POST / HTTP/1.1\r\nHost: localhost:53421\r\nContent-Type: application/json\r\nOrigin: http://localhost:53421\r\nAccept-Encoding: gzip, deflate\r\nConnection: keep-alive\r\nAccept: application/json\r\nUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.3 Safari/605.1.15\r\nReferer: http://localhost:53421/\r\nContent-Length: 22\r\nAccept-Language: en-US,en;q=0.9\r\n\r\n"
It is important to note that after a certain number of requests, the body is added and it works as expected. It is also worth mentioning that the issue only occurs in safari, and not on other browsers.

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