Multipart form-data POST using only default libraries?

Question

It would be great to get it done without any dependencies.
Here's how I'm currently doing it, but is not working:

data = urllib.parse.urlencode(
            {
                'field':'value',
                'field':'value',
                'field':'value'
            }
        ).encode('utf-8')

req = urllib.request.Request('http://www.example.com', data)

response = opener.open(req).read().decode('utf-8')

I would use `requests` which though it's not in the standard library. — Malik Brahimi, Jul 06 '15 at 16:13
It says "POST data should be bytes or an iterable of bytes. It cannot be of type str" — user4857867, Jul 06 '15 at 16:14
@MalikBrahimi, requests would really make it easier, but it would be great how to do it with urllib only. — user4857867, Jul 06 '15 at 16:15
https://stackoverflow.com/questions/1270518/python-standard-library-to-post-multipart-form-data-encoded-data — cardamom, Jan 16 '19 at 14:19

score -1 · Answer 1 · answered Jul 06 '15 at 17:22

According to documentation and example in there, you do not need to utf-8 encode the data before sending it to Request object.

So try this -

data = urllib.parse.urlencode(
            {
                'field':'value',
                'field':'value',
                'field':'value'
            }
        )

req = urllib.request.Request('http://www.example.com', data)

response = opener.open(req).read()

Multipart form-data POST using only default libraries?

1 Answers1