WebSockets

1. WebSocket API

   Browser WebSocket interface and events.

2. Writing WebSocket client apps

   Opening a WebSocket, sending and receiving messages and handling events in the browser.

3. Opening handshake

   HTTP upgrade and Sec-WebSocket-Key.

4. Data framing

   Frames, opcodes, masking and fragmentation.

5. Control frames

   Ping, pong and close control frames and keepalive behavior.

6. Closing handshake and status codes

   The closing handshake, close codes and how connections shut down.

7. Subprotocols and extensions

   Negotiating subprotocols and extensions.

8. permessage-deflate

   The permessage-deflate extension for compressing messages.

9. Security considerations

   Origin checking, client-to-server masking, TLS (wss) and other security considerations.

10. WebSockets over HTTP/2

    Bootstrapping WebSockets over HTTP/2 with the extended CONNECT method.

11. Writing WebSocket servers

    What a WebSocket server must implement: handshake, frame parsing and masking.

12. HTML Standard WebSockets section

    The WebSocket interface as defined in the HTML Standard.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

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