Allow Multipart Requests Without Attaching Files

[laipz8200]

Currently, a multipart request can only be sent when the files parameter is non-empty. This restriction limits cases where users might want to send data using multipart mode without attaching any files, which is possible in tools like Postman.

Proposed Change:

Instead of requiring files to be non-empty, we could determine the need for a multipart request based on whether files is None rather than its emptiness. This would allow users to send multipart requests without attaching files if needed.

Example Use Case:

• Sending form data using multipart mode without the need for a file upload.

Additional Context:

This change has been discussed and approved in the Q&A section with a maintainer. I’d be happy to work on this change.

I'd like to try to implement this feature, please assign this issue to me.

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• Initially raised as discussion Any Way to Send Multipart Requests Without Attaching Files? #3395