Python请求中的SSL错误

Question

I'm trying to make a request to an API using Python, but I'm getting an SSL error . I've searched it everywhere, but can't seem to find a fix.

This is the versions I have installed on my virtual environment:

Python 2.7.12 (v2.7.12:d33e0cf91556, Jun 26 2016, 12:10:39) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ssl
>>> ssl.OPENSSL_VERSION
'OpenSSL 0.9.8zg 14 July 2015'

I'm trying to use the code I found on this blog :

from requests.adapters import HTTPAdapter
from requests.packages.urllib3.poolmanager import PoolManager
import ssl
import requests

class SSLAdapter(HTTPAdapter):
    '''An HTTPS Transport Adapter that uses an arbitrary SSL version.'''
    def __init__(self, ssl_version=None, **kwargs):
        self.ssl_version = ssl_version

        super(SSLAdapter, self).__init__(**kwargs)

    def init_poolmanager(self, connections, maxsize, block=False):
        self.poolmanager = PoolManager(num_pools=connections,
                                       maxsize=maxsize,
                                       block=block,
                                       ssl_version=self.ssl_version)

if __name__ == '__main__':
    url = 'https://msesandbox.cisco.com:8081/api/location/v2/clients?sortBy=lastLocatedTime:DESC'
    s = requests.Session()
    s.mount("https://", SSLAdapter(ssl.PROTOCOL_SSLv2))
    response = s.get(url) #line that trigger the mistake.
    print (response)

This is the output:

Traceback (most recent call last):
  File "/path/to/file", line 23, in <module>
    response = s.get(url)
  File "/Users/rafacarv/Environments/python2_7_12_cmx/venv/lib/python2.7/site-packages/requests/sessions.py", line 487, in get
    return self.request('GET', url, **kwargs)
  File "/Users/rafacarv/Environments/python2_7_12_cmx/venv/lib/python2.7/site-packages/requests/sessions.py", line 475, in request
    resp = self.send(prep, **send_kwargs)
  File "/Users/rafacarv/Environments/python2_7_12_cmx/venv/lib/python2.7/site-packages/requests/sessions.py", line 585, in send
    r = adapter.send(request, **kwargs)
  File "/Users/rafacarv/Environments/python2_7_12_cmx/venv/lib/python2.7/site-packages/requests/adapters.py", line 477, in send
    raise SSLError(e, request=request)
requests.exceptions.SSLError: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590)

I also tried to use the suggestion I found on this other question , which consists of using the requests_toolbelt package, but had no luck.

How can I fix this?

Answer 1

msesandbox.cisco.com:8081

This server supports only TLS 1.2, ie no TLS 1.0 or worse.

'OpenSSL 0.9.8zg 14 July 2015'

This OpenSSL version does not support TLS 1.2 yet. You need at least OpenSSL 1.0.1 for this.