[Webkit-unassigned] [Bug 218560] New: NSPOSIXErrorDomain:100 when loading content proxied from Apache by nginx

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218560

            Bug ID: 218560
           Summary: NSPOSIXErrorDomain:100 when loading content proxied
                    from Apache by nginx
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hsivonen at hsivonen.fi
                CC: beidson at apple.com

Steps to reproduce:
1) Navigate to https://hsivonen.com/test/moz/

Actual results:
In Safari 14.0 (14610.1.28.1.10) on macOS Mojave 10.14.6, Safari says:

Safari can't open the page. The error is: "The operation couldn't be completed. Protocol error" (NSPOSIXErrorDomain:100)

In Safari on iPadOS 14.1, the error message is:

Safari could not open the page because the server stopped responding.

Firefox and Chrome load the page just fine. The page is proxied by nginx with Apache as the origin server. The same nginx instance also serves https://hsivonen.fi/ (served from flat files by nginx itself) and https://html5.validator.nu/ (proxied by with Jetty as the origin server), and Safari can load these pages from the same nginx instance.

Expected results:

Expected the page to load.

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