parsing formdata headers incorrectly.

[jimmywarting]

var type = `multipart/form-data;boundary=----formdata-polyfill-0.970665446687947`
var body = "------formdata-polyfill-0.970665446687947\r\nContent-Disposition: form-data; name=\"x\"; filename=\"blob\"\r\nContent-Length: 1\r\nContent-Type: application/octet-stream\r\nlast-modified: Wed, 04 Oct 2023 20:28:45 GMT\r\n\r\ny\r\n------formdata-polyfill-0.970665446687947--"

new Response(body, {
  headers: {
    'content-type': type
  }
}).formData().then(async fd => {
  const file = fd.get('x')
  const text = await file.text()
  console.assert(text === 'y', `expected "${text}" to equal "y"`)
  console.assert(file.size === 1, `expected file size to be 1, got ${file.size}`)
  console.log('done')
})

This works OK in firefox, safari, chromium, NodeJS, bun, but not in deno...

This is my log:

$ deno run main.js
Assertion failed: expected "last-modified: Wed, 04 Oct 2023 20:28:45 GMT

y" to equal "y"
Assertion failed: expected file size to be 1, got 49
done

it appars as if you are parsing the headers incorrectly...
a multipart/form-data can have a bunch of headers (each separated by \r\n) up on encountering a empty line \r\n should you start reading the content as the body.

[marcosc90]

I'll take a look.