_get_response without headers doesn't work (at least with 'yahoo' source #867
Description
to fix, I put in base.py:
def _get_response(self, url, params=None, headers=None):
""" send raw HTTP request to get requests.Response from the specified url
Parameters
----------
url : str
target URL
params : dict or None
parameters passed to the URL
"""
# initial attempt + retry
if headers == None:
headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36'}
pause = self.pause