Content-Type in for individual files in python requests

If you make each file specification a tuple, you can specify the mime type as a third parameter:

files = {
    'file1': ('foo.gif', open('foo.gif', 'rb'), 'image/gif'),
    'file2': ('bar.png', open('bar.png', 'rb'), 'image/png'),
}
response = requests.post(url, files=files)

You can give a 4th parameter as well, which must be a dictionary with additional headers for each part.

See the Requests API documentation:

file-tuple can be a 2-tuple ('filename', fileobj), 3-tuple ('filename', fileobj, 'content_type') or a 4-tuple ('filename', fileobj, 'content_type', custom_headers), where 'content-type' is a string defining the content type of the given file and custom_headers a dict-like object containing additional headers to add for the file.

reference

    import requests

    url = "http://png_upload_example/upload"
    # files = [(<key>, (<filename>, open(<file location>, 'rb'), <content type>))]
    files = [('upload', ('thumbnail.png', open('thumbnail.png', 'rb'), 'image/png'))]

    response = requests.request("POST", url, files = files)