title: I send an websocket package,but the server just answers 400
body: <p>Here is my code:
  <a href="https://i.stack.imgur.com/ZKow9.png" rel="nofollow noreferrer">enter image description here</a>
  I make a socket connection by usual,and just want to send the headers.
  And the //was the headers which I had tired to add,but it did not work.
  could anyone give me some advices?</p>