return request('HEAD', url, params=params, headers=headers, cookies=cookies, auth=auth, timeout=timeout)
-def post(url, data=None, headers=None, files=None, cookies=None, auth=None, timeout=None, allow_redirects=False):
+def post(url, data='', headers=None, files=None, cookies=None, auth=None, timeout=None, allow_redirects=False):
"""Sends a POST request. Returns :class:`Response` object.
:param url: URL for the new :class:`Request` object.
timeout=timeout, allow_redirects=allow_redirects)
-def put(url, data=None, headers=None, files=None, cookies=None, auth=None, timeout=None, allow_redirects=False):
+def put(url, data='', headers=None, files=None, cookies=None, auth=None, timeout=None, allow_redirects=False):
"""Sends a PUT request. Returns :class:`Response` object.
:param url: URL for the new :class:`Request` object.