new_contents: import pytest
  import requests
      
  def test_http2_server_push (launch):
      proxies = {
          'http': 'http://127.0.0.1:30371',
          'https': 'http://127.0.0.1:30371',
      }
      with launch ("./examples/proxy.py") as engine:
          resp = requests.get ("http://example.com/", proxies)
          assert resp.status_code == 200
          assert "Example Domain" in resp.text
          
          resp = requests.get ("https://pypi.org/project/rs4/", proxies)
          assert resp.status_code == 200
          assert "Project description" in resp.text
  
subject: add test_proxy.py