old_contents: try:
      import rawsocket as socket
  except:
      import socket
  
  
  CONTENT = """\
  HTTP/1.0 200 OK
  
  Hello #{} from MicroPython!
  """
  
  s = socket.socket()
  
  ai = socket.getaddrinfo("127.0.0.1", 8080)
  print("Bind address info:", ai)
  addr = ai[0][4]
  
  s.bind(addr)
  s.listen(5)
  print("Listening, connect your browser to http://127.0.0.1:8080/")
  
  counter = 0
  while True:
      res = s.accept()
      client_s = res[0]
      client_addr = res[1]
      print("Client address:", client_addr)
      print("Client socket:", client_s)
      print("Request:")
      if 0:
          # MicroPython rawsocket module supports file interface directly
          print(client_s.read(4096))
          #print(client_s.readall())
          client_s.write(CONTENT.format(counter))
      else:
          print(client_s.recv(4096))
          client_s.send(bytes(CONTENT.format(counter), "ascii"))
      client_s.close()
      counter += 1
  
new_contents: try:
      import rawsocket as socket
  except:
      import socket
  
  
  CONTENT = """\
  HTTP/1.0 200 OK
  
  Hello #{} from MicroPython!
  """
  
  s = socket.socket()
  
  ai = socket.getaddrinfo("127.0.0.1", 8080)
  print("Bind address info:", ai)
  addr = ai[0][4]
  
  s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
  s.bind(addr)
  s.listen(5)
  print("Listening, connect your browser to http://127.0.0.1:8080/")
  
  counter = 0
  while True:
      res = s.accept()
      client_s = res[0]
      client_addr = res[1]
      print("Client address:", client_addr)
      print("Client socket:", client_s)
      print("Request:")
      if 0:
          # MicroPython rawsocket module supports file interface directly
          print(client_s.read(4096))
          #print(client_s.readall())
          client_s.write(CONTENT.format(counter))
      else:
          print(client_s.recv(4096))
          client_s.send(bytes(CONTENT.format(counter), "ascii"))
      client_s.close()
      counter += 1
  
subject: Use SO_REUSEADDR to avoid errors on quick restart.