While writing the test for my side project, I encountered a problem which didn't happen while using Travis CI but CircleCI.

TL;DR

Add

sudo sed -i -E 's/MinProtocol[=\ ]+.*/MinProtocol = TLSv1.0/g' /etc/ssl/openssl.cnf

in .circleci/config.yml before running the test which will connect to the website uses TLSv1.0.

Exception

Traceback (most recent call last):
  File "/home/circleci/repo/venv/lib/python3.5/site-packages/urllib3/connectionpool.py", line 677, in urlopen
    chunked=chunked,
  File "/home/circleci/repo/venv/lib/python3.5/site-packages/urllib3/connectionpool.py", line 381, in _make_request
    self._validate_conn(conn)
  File "/home/circleci/repo/venv/lib/python3.5/site-packages/urllib3/connectionpool.py", line 976, in _validate_conn
    conn.connect()
  File "/home/circleci/repo/venv/lib/python3.5/site-packages/urllib3/connection.py", line 370, in connect
    ssl_context=context,
  File "/home/circleci/repo/venv/lib/python3.5/site-packages/urllib3/util/ssl_.py", line 377, in ssl_wrap_socket
    return context.wrap_socket(sock, server_hostname=server_hostname)
  File "/usr/local/lib/python3.5/ssl.py", line 385, in wrap_socket
    _context=self)
  File "/usr/local/lib/python3.5/ssl.py", line 760, in __init__
    self.do_handshake()
  File "/usr/local/lib/python3.5/ssl.py", line 996, in do_handshake
    self._sslobj.do_handshake()
  File "/usr/local/lib/python3.5/ssl.py", line 641, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: UNSUPPORTED_PROTOCOL] unsupported protocol (_ssl.c:728)

Another solution which DIDN'T work for me

import requests
import ssl

requests.get(url, verify=ssl.CERT_NONE)

References

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