requests_multipart_hack.py

import email.utils
from requests.packages.urllib3.packages import six


def format_header_param(name, value):
    """
    Helper function to format and quote a single header parameter.

    Particularly useful for header parameters which might contain
    non-ASCII values, like file names. This follows RFC 2231, as
    suggested by RFC 2388 Section 4.4.

    :param name:
        The name of the parameter, a string expected to be ASCII only.
    :param value:
        The value of the parameter, provided as a unicode string.
    """
    orig_value = value
    if not any(ch in value for ch in '"\\\r\n'):
        result = '%s="%s"' % (name, value)
        try:
            result.encode('ascii')
        except UnicodeEncodeError:
            pass
        else:
            return result
    if not six.PY3:  # Python 2:
        value = value.encode('utf-8')
    value = email.utils.encode_rfc2231(value, 'utf-8')
    value = '%s*=%s' % (name, value)
    if name == "name":
        value = 'name="%s"; %s' % (orig_value, value)
    return value

from requests.packages.urllib2 import fields

fields.format_header_param = format_header_param

requests_multipart_hack2.py

import email.utils
from requests.packages.urllib3.packages import six


def format_header_param(name, value):
    return u'%s="%s"' % (name, value)

from requests.packages.urllib3 import fields
fields.format_header_param = format_header_param