text: from __future__ import absolute_import, division, print_function
  
  import os
  
  import stripe
  
  
  stripe.api_key = os.environ.get("STRIPE_SECRET_KEY")
  
  print("Attempting charge...")
  
  stripe.proxy = {
      "http": "http://<user>:<pass>@<proxy>:<port>",
      "https": "http://<user>:<pass>@<proxy>:<port>",
  }
  
  clients = (
      stripe.http_client.RequestsClient(
          verify_ssl_certs=stripe.verify_ssl_certs, proxy=stripe.proxy
      ),
      stripe.http_client.PycurlClient(
          verify_ssl_certs=stripe.verify_ssl_certs, proxy=stripe.proxy
      ),
      stripe.http_client.Urllib2Client(
          verify_ssl_certs=stripe.verify_ssl_certs, proxy=stripe.proxy
      ),
  )
  
  for c in clients:
      stripe.default_http_client = c
      resp = stripe.Charge.create(
          amount=200,
          currency="usd",
          card="tok_visa",
          description="customer@gmail.com",
      )
      print("Success: %s, %r" % (c.name, resp))
  