Add a Config for multipart.NewWriter

[earthboundkid]

API could look like .Config(requests.BodyMultipart(func (w *multipart.Writer) error { /* ... */ })). It could handle setting the content type and closing the writer junk.

[Phathdt]

do we have example for body multypart like this postman ?

@carlmjohnson

[earthboundkid]

If I understand correctly, your body is form data, not necessarily multipart, so you can just do

chatpng, _ := os.ReadFile("chat.png")

err := requests.
  URL(requrl).
  BodyForm(url.Values{
    "image": chatpng,
  }).
  Fetch(ctx)

If that won't work, someone will need to actually write a multipart mime encoder config. I looked into it once but have not needed it personally, so it's not written.

[Crocmagnon]

I just had the need to send multipart data to a picky server. Here's what I came up with, if others are interested:

boundary := randomBoundary()

err := requests.URL(url).
	Method(http.MethodPost).
	Header("Content-Type", "multipart/form-data; boundary="+boundary).
	BodyWriter(func(w io.Writer) error {
		multi := multipart.NewWriter(w)

		if err := multi.SetBoundary(boundary); err != nil {
			return fmt.Errorf("setting boundary: %w", err)
		}

		writer, err := multi.CreateFormFile("file", filename)
		if err != nil {
			return fmt.Errorf("creating form file: %w", err)
		}

		if _, err := io.Copy(writer, reader); err != nil {
			return fmt.Errorf("copying file: %w", err)
		}

		if err := multi.Close(); err != nil {
			return fmt.Errorf("closing multipart writer: %w", err)
		}

		return nil
	}).
	Fetch(ctx)

[earthboundkid]

I opened a PR: https://github.com/earthboundkid/requests/pull/119/files