@felixge a multipart/byteranges response would look something like this (taken from RFC 7233):

HTTP/1.1 206 Partial Content
Date: Wed, 15 Nov 1995 06:25:24 GMT
Last-Modified: Wed, 15 Nov 1995 04:58:08 GMT
Content-Length: 1741
Content-Type: multipart/byteranges; boundary=THIS_STRING_SEPARATES

--THIS_STRING_SEPARATES
Content-Type: application/pdf
Content-Range: bytes 500-999/8000

...the first range...
--THIS_STRING_SEPARATES
Content-Type: application/pdf
Content-Range: bytes 7000-7999/8000

...the second range
--THIS_STRING_SEPARATES--

I imagine the parsed body would end up looking like this:

[
  {
    "headers": {
      "content-type": "application/pdf",
      "content-range": "bytes 500-999/8000"
    },
    "body": "...the first range..."
  },
  {
    "headers": {
      "content-type": "application/pdf",
      "content-range": "bytes 7000-7999/8000"
    },
    "body": "...the second range"
  }
]

Ideally this functionality would just be an additional parser like lib/byterange_parser.js where it would be used if the response's Content-Type started with multipart/byteranges. I've managed to get the desired output by overwriting formidable.IncomingForm.prototype.parse:

formidable.IncomingForm.prototype.parse = function parseByteRanges (res, done) {
  const parts = []
  let totalLength = 0
  res.on('error', done).on('data', (chunk) => {
    parts.push(chunk)
    totalLength += chunk.length
  }).on('end', () => {
    try {
      const boundary = res.headers['content-type'].match(/boundary=(.+)$/)[1]
      const body = Buffer.concat(parts, totalLength)
      done(null, parseMultipartBody(body.toString(), boundary))
    } catch (e) {
      done(e)
    }
  })
}

function parseMultipartBody (body, boundary) {
  return body.split('--' + boundary).reduce((memo, part) => {
    if (part && part !== '--') {
      const [ head, body ] = part.trim().split(/\r\n\r\n/g)
      memo.push({
        headers: head.split(/\r\n/).reduce((memo, header) => {
          const [ key, val ] = header.split(/:\s+/)
          memo[key.toLowerCase()] = val
          return memo
        }, {}),
        body: body
      })
    }
    return memo
  }, [])
}

Support parsing of multipart/byteranges #390

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