title: What does "258EAFA5-E914-47DA-95CA-C5AB0DC85B11" means in WebSocket Protocol
body: <p>I don't understand the meaning of &quot;258EAFA5-E914-47DA-95CA-C5AB0DC85B11&quot; in <a href="https://www.rfc-editor.org/rfc/rfc6455" rel="nofollow noreferrer">RFC 6455</a>.
  Why does the server need this magic string?
  And why does the WebSocket protocol need this mechanism?</p>