Additional debug messaging #586
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The kind of change this PR does introduce
Current behaviour
Troubleshooting by turning debug messages on for engine.io does not reveal reason for error for:
New behaviour
Turning debug messages on for engine.io provides debug logging to help indicate
reason for various 400 bad request messages.
Other information (e.g. related issues)
These additional messages would have helped more quickly diagnose the
reason for error messages we were seeing on a socket.io server interfacing with
many different socket.io client libraries.