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jimmywarting / FormData

HTML5 `FormData` polyfill for Browsers and nodejs
MIT License
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Empty file fields ignored #78

Closed xtianus closed 5 years ago

xtianus commented 5 years ago

When I send a form in Chrome, empty file fields are sent with the multipart request:

------WebKitFormBoundaryWyYGnblSdE4D3eyO Content-Disposition: form-data; name="segmentationFile"; filename="" Content-Type: application/octet-stream

When I use the polyfill in Safari, the empty fields are ignored and not sent with the request at all. Is this the expected behavior? This forces me to check for null entries on the server when the request comes from Safari. From Chrome I'd have a non-null zero-length entry.

jimmywarting commented 5 years ago

hmm, you are right... Just tested the native behavior on FF, chrome & safari. what a strange behavior i think.

jimmywarting commented 5 years ago

Figured if someone mutate the window.File (or blob) and you want to restore it you could always do this

window.File = 'Meh!'
form = document.createElement('form')
form.innerHTML = '<input type=file name=foo>'
window.File = new FormData(form).get('foo').constructor
file = new File(['abc'], 'sample.txt') // works again!

Weird...