[A-Lagopus]

Wow, thank you so much for replying!

Unfortunately, I'm still struggling to import responses...

If I put requests and urrlib into my folder and put these inside the module:

from calibre_plugins.kybook3_sync.urllib3 import urllib3
from calibre_plugins.kybook3_sync.requests import requests

Then I get this traceback:

  File "calibre/customize/zipplugin.py", line 192, in exec_module
  File "calibre_plugins.kybook3_sync.urllib3.util.connection", line 5, in <module>
    from urllib3.exceptions import LocationParseError
ModuleNotFoundError: No module named 'urllib3'

I wonder if I'm not approaching it from the right angle...

Essentially this code doesn't work with calibre:

def _encode_multipart_formdata(self, fields, files):
        limit = '-----------------------------'
        num = str(int((datetime.now() - datetime(1970, 1, 1)).total_seconds()))
        limit = limit + num
        crlf = '\r\n'
        lines = []
        for (key, value) in fields:
            lines.append('--' + limit)
            lines.append('Content-Disposition: form-data; name="%s"' % key)
            lines.append('')
            if isinstance(value,bytes):
                lines.append(value.decode())
            else:
                lines.append(value)
        for (key, filename, value) in files:
            lines.append('--' + limit)
            lines.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))
            lines.append('Content-Type: %s' % self._get_content_type(filename))
            lines.append('')
            if isinstance(value,bytes):
                lines.append(value.decode())
            else:
                lines.append(value)
        lines.append('--' + limit + '--')
        lines.append('')
        body = crlf.join(lines)
        content_type = 'multipart/form-data; boundary=%s' % limit
        return content_type, body

in python3 it gives an error

line = ''.join(line.split())
TypeError: sequence item 0: expected str instance, bytes found

I wonder what's the most efficient way to resolve this is... So far I tried
1) Fixing the routine by changing all '' with b'' - didn't work due to me not knowing what's the encoding of a file I'm getting
2) Importing requests - a hassle, possible cross-platform issues

What would you suggest as the 'neatest' and most calibre-like way of uploading a file to a web server that uses simple plain-text authorization?