input: Write a python function to create an HTTP server that responds with 'Hello World!' to GET requests.
  assert check_server_response('http://localhost:8080') == 'Hello World!'
  assert check_server_response('http://localhost:8080') != 'Goodbye World!'
  assert check_server_response('http://localhost:8080') == 'Hello World!'
output: def run_http_server():
      from http.server import BaseHTTPRequestHandler, HTTPServer
  
      class HelloWorldHandler(BaseHTTPRequestHandler):
          def do_GET(self):
              self.send_response(200)
              self.send_header('Content-type', 'text/plain')
              self.end_headers()
              self.wfile.write(b'Hello World!')
  
      server_address = ('', 8080)
      httpd = HTTPServer(server_address, HelloWorldHandler)
      print('Running server on port 8080...')
      httpd.serve_forever()