How to view WS/WSS Websocket request content using Firebug or other?

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Try Chrome’s developer tools,

  1. click ‘Network’ tab
  2. use the filters at the bottom to show only WebSocket connections),
  3. select the desired websocket connection,
  4. note that there are ‘Headers’, ‘Preview’, ‘Response’, etc. sub-tabs
    to the right,
  5. once data starts flowing a ‘WebSocket Frames’ subtab will appear.
    All data going in either direction is logged. Very informative.

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