def get_serving_url(blob_key, size=None, crop=False, secure_url=None, filename=None, rpc=None):
 rpc = get_serving_url_async(blob_key, size, crop, secure_url, filename, rpc)
 return rpc.get_result()

def get_serving_url ( blob_key , size = None , crop = False , secure_url = None , filename = None , rpc = None ) : rpc = get_serving_url_async ( blob_key , size , crop , secure_url , filename , rpc ) return rpc . get_result ( )
obtain a url that will serve the underlying image .