[Suggestion] Add more per-entry headers

[jimmywarting]

This is not in the specification but i can see a value by adding a Content-Length header before every entry so it would look something like this

------WebKitFormBoundaryI2aNXnjBifHTBeH1
Content-Disposition: form-data; name="x"; filename="dummy.txt"
Content-Type: text/plain
Content-Length: 3

abc
------WebKitFormBoundaryI2aNXnjBifHTBeH1--

(fyi this has nothing to do with request headers - only form-data entries headers in the body)

• decoders (backends) could rely on content-length and let let x amount of bytes pass throught instead of scanning for a boundary separators.
• decoding a form-data could be faster
• decoders would know earlier how large a file upload is before you receive a hole file.

This could easily be added without any code changes on developers parts.

Last-Modified header could also be inherited/included from a File instance with the lastModified property.

I bet no decoders would even use, care or break anything if they saw this two extra entry headers.

I have already written to whatwg on github and suggested that this two extra per-entry headers gets added - if you want to get some more background context.

I think i could add them into this library without breaking anything. ...Would like to hear what someone else have to say about this. Should i include them?

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