MultipartInvariantViolation

DEBUG:requests.packages.urllib3.connectionpool:"GET /mjpeg.cgi HTTP/1.1" 200 None
WARNING:requests.packages.urllib3.connectionpool:Failed to parse headers (url=http://192.168.0.26:80/mjpeg.cgi): [StartBoundaryNotFoundDefect(), MultipartInvariantViolationDefect()], unparsed data: ''
Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/requests/packages/urllib3/connectionpool.py", line 398, in _make_request

It’s a known issue of the Urllib3, as stated here. You can just ignore the error messages.