)
        r = requests.post('https://httpbin.org/post', data=encoder,
                          headers={'Content-Type': encoder.content_type})

    If you do not need to take advantage of streaming the post body, you can
    also do:

    .. code-block:: python

        r = requests.post('https://httpbin.org/post',
                          data=encoder.to_string(),
                          headers={'Content-Type': encoder.content_type})

    If you want the encoder to use a specific order, you can use an
    OrderedDict or more simply, a list of tuples:

    .. code-block:: python

        encoder = MultipartEncoder([('field', 'value'),
                                    ('other_field', 'other_value')])

    .. versionchanged:: 0.4.0

    You can also provide tuples as part values as you would provide them to
    requests' ``files`` parameter.

    .. code-block:: python

        encoder = MultipartEncoder({
            'field': ('file_name', b'{"a": "b"}', 'application/json',
                      {'X-My-Header': 'my-value'})
        ])

    .. warning::

        This object will end up directly in :mod:`httplib`. Currently,
        :mod:`httplib` has a hard-coded read size of **8192 bytes**. This
        means that it will loop until the file has been read and your upload
        could take a while. This is **not** a bug in requests. A feature is
        being considered for this object to allow you, the user, to specify
        what size should be returned on a read. If you have opinions on this,
        please weigh in on `this issue`_.

    .. _this issue:
        https://github.com/sigmavirus24/requests-toolbelt/issues/75

    Nú