cannot suppress urllib3 warnings

Library:

• pywinrm==0.3.0
• requests==2.22.0
• urllib3==1.25.3

Issues: urllib3.exceptions.HeaderParsingError isn’t suppressed

Python Code:

import logging
import winrm
logging.basicConfig(level=logging.DEBUG)
session = winrm.Session(remote, auth=(username, password), transport="ntlm", server_cert_validation="ignore")
result = session.run_cmd('ipconfig', ['/all'])
logging.info(result.std_out.decode())

Trace:

DEBUG:urllib3.connectionpool:Starting new HTTP connection (1): nangs-jw1.eng.citrite.net:5985
DEBUG:urllib3.connectionpool:http://nangs-jw1.eng.citrite.net:5985 "POST /wsman HTTP/1.1" 401 0
DEBUG:urllib3.connectionpool:Resetting dropped connection: nangs-jw1.eng.citrite.net
DEBUG:urllib3.connectionpool:http://nangs-jw1.eng.citrite.net:5985 "POST /wsman HTTP/1.1" 401 0
DEBUG:urllib3.connectionpool:http://nangs-jw1.eng.citrite.net:5985 "POST /wsman HTTP/1.1" 200 0
DEBUG:urllib3.connectionpool:http://nangs-jw1.eng.citrite.net:5985 "POST /wsman HTTP/1.1" 200 1896
WARNING:urllib3.connectionpool:Failed to parse headers (url=http://nangs-jw1.eng.citrite.net:5985/wsman): [StartBoundaryNotFoundDefect(), MultipartInvariantViolationDefect()], unparsed data: ''
Traceback (most recent call last):
  File "/home/administrator/.pyenv/versions/3.7.4/lib/python3.7/site-packages/urllib3/connectionpool.py", line 399, in _make_request
    assert_header_parsing(httplib_response.msg)
  File "/home/administrator/.pyenv/versions/3.7.4/lib/python3.7/site-packages/urllib3/util/response.py", line 72, in assert_header_parsing
    raise HeaderParsingError(defects=defects, unparsed_data=unparsed_data)
urllib3.exceptions.HeaderParsingError: [StartBoundaryNotFoundDefect(), MultipartInvariantViolationDefect()], unparsed data: ''

[benjamin-heimann-db]

In urllib3==1.25.11 this issue exists, while in the newest version urllib3==1.26.6 it is fixed for me.

[badcure]

Script used: httplib_response_testing.py

Going through that script(I wanted to be 100% sure), it does look like an issue upstream. Testing the output from an encrypted and non-encrypted server displays the following:

p[brian.price@localhost pywinrm]$ python3 httplib_testing.py 
Headers
Content-Type: multipart/encrypted;protocol="application/HTTP-SPNEGO-session-encrypted";boundary="Encrypted Boundary"
Server: Microsoft-HTTPAPI/2.0
Date: Fri, 16 Aug 2019 19:28:01 GMT
Content-Length: 1895


Defects
[StartBoundaryNotFoundDefect(), MultipartInvariantViolationDefect()]
Unencrypted
Headers
Content-Type: application/soap+xml;charset=UTF-8
Server: Microsoft-HTTPAPI/2.0
Date: Fri, 16 Aug 2019 19:32:37 GMT
Content-Length: 1637


Defects
[]

After some debugging, the errors are not really a problem IMO. When http_client.HTTPResponse passes on the header only for processing toemail.parser.Parser here , those errors are generated because it believes it is processing an entire response.

The parsestr allows to specify that it is headers only, and not attempt to process any body. The definition is here

I think suppressing these errors may be the best course of action for now…