input: Write a python function to create a simple HTTP server that responds with "Hello, World!".
  assert get_http_response('http://localhost:8000') == "Hello, World!"
  assert isinstance(create_http_server(), http.server.HTTPServer)
  assert create_http_server().server_port == 8000
output: import http.server
  import socketserver
  
  def create_http_server():
      class MyHandler(http.server.SimpleHTTPRequestHandler):
          def do_GET(self):
              self.send_response(200)
              self.send_header("Content-type", "text/html")
              self.end_headers()
              self.wfile.write(b"Hello, World!")
  
      PORT = 8000
      with socketserver.TCPServer(("", PORT), MyHandler) as httpd:
          return httpd
  
  def get_http_response(url):
      import requests
      response = requests.get(url)
      return response.text