post form-data not support customized headers

[charleshuangcai]

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[charleshuangcai]

when post form-data, i want to add some headers for each part, but it only has "key", "value", and "content-type"

[codenirvana]

@charleshuangcai currently you can only configure a custom content-type for each part. The rest of the headers are added automatically based on the type when the request is sent.

Can you tell more about your use-case and what are these additional headers which you want to include?

[charleshuangcai]

In mine case, i want to add more fields in content-disposition except 'name' and 'filename' to identify the file metadata. In addition, content-md5 is available. Looking forward the new feature!

[markhowells]

I need to be able to add a Content-Transfer-Encoding header to an uploaded file signify that the image file is base64 encoded ...

[Antonhansel]

Hello @codenirvana

I'm facing the same issue when using Google Apis upload methods where sending metadata along the content is required, for example: https://developers.google.com/display-video/api/guides/how-tos/upload#multipart
As explained in the doc, two content-type headers need to be set for different parts of the request.

POST /upload/farm/v1/animals?uploadType=multipart HTTP/1.1
Host: www.googleapis.com
Authorization: Bearer your_auth_token
Content-Type: multipart/related; boundary=foo_bar_baz
Content-Length: number_of_bytes_in_entire_request_body

--foo_bar_baz
Content-Type: application/json; charset=UTF-8

{
  "name": "Llama"
}

--foo_bar_baz
Content-Type: image/jpeg

JPEG data
--foo_bar_baz--

Thank you for your time.

[hrancic]

It would be great to have the option to specify Content-Length header for each of the multi part parts, for example like in the following curl (imagine I am sending two files: meta_file and data_file)
curl -X POST <endpoint> -F"meta_file=@meta-file;headers=\"Content-Length: 123\"" -F"data_file=@data-file;headers=\"Content-Length: 123456\""

Should I open a separate issue for this feature?