Bug 262635 – FetchResponse.formData() should parse headers names as case insensitive

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Jimmy Wärting]

## reproducible code:

async function init() {
  var fd = new FormData()
  fd.set('x', 'y')
  var blob = await new Response(fd).blob()
  var body = await blob.text()
  blob = new Blob([body.toLowerCase()], { 
    // convert boundary to lowercase also.
    type: blob.type.toLowerCase() 
  })
  fd = await new Response(blob).formData()
  console.log([...fd])
}

init()


## Test page:
https://jsfiddle.net/x0o1mqj8/


Works in Firefox, and all chromium browsers
fails in safari

[sideshowbarker]

Pull request: https://github.com/WebKit/WebKit/pull/18689

[sideshowbarker]

If we do actually want to have interop on this, I can add WPT tests to the PR — and also I guess, update the algorithm at https://fetch.spec.whatwg.org/#dom-body-formdata to explicitly that the Content-Disposition and Content-Type headers names must be parsed case-insensitively. (Though, as noted in the comment which follows that algorithm in the spec: The algorithm is just “a rough approximation of what is needed for multipart/form-data” — that is, it’s already recognized to be underspecified…)

[sideshowbarker]

Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/42455

[EWS]

Committed 269144@main (d0c370d532ad): <https://commits.webkit.org/269144@main>

Reviewed commits have been landed. Closing PR #18689 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/116742000>