[Webkit-unassigned] [Bug 221549] New: Empty <input type=file> controls don't show up in the urlencoded and text/plain enctypes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221549

            Bug ID: 221549
           Summary: Empty <input type=file> controls don't show up in the
                    urlencoded and text/plain enctypes
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: abb at randomunok.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

The HTML spec's algorithm to construct the entry list (https://html.spec.whatwg.org/#constructing-the-form-data-set) requires that an <input type=file> control with no selected files is represented in the entry list as a File object. And WebKit follows this for the multipart/form-data enctype, but in the urlencoded and text/plain serializations that entry simply doesn't show up in the payload.

Tests: https://wpt.fyi/results/html/semantics/forms/form-submission-0/form-data-set-empty-file.window.html?label=pr_head&max-count=1&pr=27523
(this test file also tests for bug 185416)

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