python coinbase http call

coinbase_http.py

# there is a problem with the coinbase python example
# at https://coinbase.com/docs/api/authentication where they
# fail to add the content type header to the POST action
# this is the actual implementation

def get_http(self, url, body=None):
        opener = urllib2.build_opener()
        nonce = int(time.time() * 1e6)
        message = str(nonce) + url + ('' if body is None else body)
        signature = hmac.new(settings.COINBASE_API_SECRET, message, hashlib.sha256).hexdigest()
        opener.addheaders = [('ACCESS_KEY', settings.COINBASE_API_KEY),
                             ('ACCESS_SIGNATURE', signature),
                             ('ACCESS_NONCE', nonce)]
        try:
            response = opener.open(urllib2.Request(url,body,{'Content-Type': 'application/json'}))
            return response
        except urllib2.HTTPError as e:
            print e
            return e