update headers in lowercase to allow overriding of auth headers

Author: honzakral

elasticsearch/connection/http_urllib3.py

@@ -50,13 +50,17 @@ def __init__(self, host='localhost', port=9200, http_auth=None,
  ssl_assert_fingerprint=None, maxsize=10, headers=None, **kwargs):
 
  super(Urllib3HttpConnection, self).__init__(host=host, port=port, use_ssl=use_ssl, **kwargs)
- self.headers = headers.copy() if headers else {}
- self.headers.update(urllib3.make_headers(keep_alive=True))
+ self.headers = urllib3.make_headers(keep_alive=True)
  if http_auth is not None:
  if isinstance(http_auth, (tuple, list)):
  http_auth = ':'.join(http_auth)
  self.headers.update(urllib3.make_headers(basic_auth=http_auth))
 
+ # update headers in lowercase to allow overriding of auth headers
+ if headers:
+ for k in headers:
+ self.headers[k.lower()] = headers[k]
+
  ca_certs = CA_CERTS if ca_certs is None else ca_certs
  pool_class = urllib3.HTTPConnectionPool
  kw = {}