:param _request_timeout: timeout setting for this request. If one

number provided, it will be total request

timeout. It can also be a pair (tuple) of

"""

method = method.upper()

assert method in ['GET', 'HEAD', 'DELETE', 'POST', 'PUT',

post_params = post_params or {}

headers = headers or {}

if 'Content-Type' not in headers:

headers['Content-Type'] = 'application/json'