We can use .formData()
of Body
mixin to return a FormData
representation of data at Chromium (Chrome) 60+ and Firefox 39+
Relevant specifications:
Errata
- Clarification of Body package data algorithm with bytes, FormData and multipart/form-data MIME type #392
- Documenting de-facto handling of multipart/form-data form field file uploads #3040
Related
How to manually create multipart/form-data
using JavaScript at client and at server to serve the multipart/form-data
as a response?