Simple Krakenize built for Django

Kraken.py

from django.conf import settings
import requests
import simplejson as json

def krakenize(url, height=None, width=None):
    '''
    Krakenizes an image url and returns a file object.
    @return-example:
    b'{"file_name":"P1jX7RP.jpg","original_size":68979,
    "kraked_size":65234,"saved_bytes":3745,
    "kraked_url":"https://dl.kraken.io/api/b74fe7e276ebf07178f9f1657
    cee1f30/P1jX7RP.jpg","success":true}'
    '''
    params = {
    'auth': {
        'api_key': settings.KRAKEN_IO_API_KEY,
        'api_secret': settings.KRAKEN_IO_API_SECRET,
    },
    'url': url,
    'wait': True
    }

    if height is not None or width is not None:
        if height is not None and width is not None:
            params['resize'] = {
                    'width': height,
                    'height': width,
                    'strategy': 'crop'
                }
        else:
            raise Exception("You need to provide a width and height")
    url = 'https://api.kraken.io/v1/url'
    resp = requests.post(url, data=json.dumps(params), headers={'Content-type': 'application/json', 'Accept': 'text/plain'})
    resp_j = json.loads(resp.content)
    if resp_j["success"]:
        return resp_j["kraked_url"]
    else:
        raise Exception("Kraken.io returned an error")