content: """Benchark parsing WebSocket handshake requests."""
  
  # The parser for responses is designed similarly and should perform similarly.
  
  import sys
  import timeit
  
  from websockets.http11 import Request
  from websockets.streams import StreamReader
  
  
  CHROME_HANDSHAKE = (
      b"GET / HTTP/1.1\r\n"
      b"Host: localhost:5678\r\n"
      b"Connection: Upgrade\r\n"
      b"Pragma: no-cache\r\n"
      b"Cache-Control: no-cache\r\n"
      b"User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) "
      b"AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36\r\n"
      b"Upgrade: websocket\r\n"
      b"Origin: null\r\n"
      b"Sec-WebSocket-Version: 13\r\n"
      b"Accept-Encoding: gzip, deflate, br\r\n"
      b"Accept-Language: en-GB,en;q=0.9,en-US;q=0.8,fr;q=0.7\r\n"
      b"Sec-WebSocket-Key: ebkySAl+8+e6l5pRKTMkyQ==\r\n"
      b"Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits\r\n"
      b"\r\n"
  )
  
  FIREFOX_HANDSHAKE = (
      b"GET / HTTP/1.1\r\n"
      b"Host: localhost:5678\r\n"
      b"User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) "
      b"Gecko/20100101 Firefox/111.0\r\n"
      b"Accept: */*\r\n"
      b"Accept-Language: en-US,en;q=0.7,fr-FR;q=0.3\r\n"
      b"Accept-Encoding: gzip, deflate, br\r\n"
      b"Sec-WebSocket-Version: 13\r\n"
      b"Origin: null\r\n"
      b"Sec-WebSocket-Extensions: permessage-deflate\r\n"
      b"Sec-WebSocket-Key: 1PuS+hnb+0AXsL7z2hNAhw==\r\n"
      b"Connection: keep-alive, Upgrade\r\n"
      b"Sec-Fetch-Dest: websocket\r\n"
      b"Sec-Fetch-Mode: websocket\r\n"
      b"Sec-Fetch-Site: cross-site\r\n"
      b"Pragma: no-cache\r\n"
      b"Cache-Control: no-cache\r\n"
      b"Upgrade: websocket\r\n"
      b"\r\n"
  )
  
  WEBSOCKETS_HANDSHAKE = (
      b"GET / HTTP/1.1\r\n"
      b"Host: localhost:8765\r\n"
      b"Upgrade: websocket\r\n"
      b"Connection: Upgrade\r\n"
      b"Sec-WebSocket-Key: 9c55e0/siQ6tJPCs/QR8ZA==\r\n"
      b"Sec-WebSocket-Version: 13\r\n"
      b"Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits\r\n"
      b"User-Agent: Python/3.11 websockets/11.0\r\n"
      b"\r\n"
  )
  
  
  def parse_handshake(handshake):
      reader = StreamReader()
      reader.feed_data(handshake)
      parser = Request.parse(reader.read_line)
      try:
          next(parser)
      except StopIteration:
          pass
      else:
          raise AssertionError("parser should return request")
      reader.feed_eof()
      assert reader.at_eof(), "parser should consume all data"
  
  
  def run_benchmark(name, handshake, number=10000):
      ph = (
          min(
              timeit.repeat(
                  "parse_handshake(handshake)",
                  number=number,
                  globals={"parse_handshake": parse_handshake, "handshake": handshake},
              )
          )
          / number
          * 1_000_000
      )
      print(f"{name}\t{len(handshake)}\t{ph:.1f}")
  
  
  if __name__ == "__main__":
      print("Sizes are in bytes. Times are in µs per frame.", file=sys.stderr)
      print("Run `tabs -16` for clean output. Pipe stdout to TSV for saving.")
      print(file=sys.stderr)
  
      print("client\tsize\ttime")
      run_benchmark("Chrome", CHROME_HANDSHAKE)
      run_benchmark("Firefox", FIREFOX_HANDSHAKE)
      run_benchmark("websockets", WEBSOCKETS_HANDSHAKE)
  