import ssl
import requests
import urllib3
http = urllib3.PoolManager()

hostname = 'codesignsecureapi.encryptionconsulting.com'
port = 443

f = open('cert.der', 'wb')
cert = ssl.get_server_certificate((hostname, port))
f.write(ssl.PEM_cert_to_DER_cert(cert))
# requests.get('https://codesignsecurec.encryptionconsulting.com',
#              verify=False)

http.request("GET", "https://codesignsecureapi.encryptionconsulting.com")