Unable to receive socket id from Echo instance

[uppercode]

The js implementation here.

The reason to receive it described here. In few words, I need attach X-Socket-ID header with socket id in my http requests to exclude myself from broadcasting.

This enhancement is way simple, but I'm not a Java developer and it's complicated for me to make pull request.

[orhangulcan]

Hey,
I need socket id to exclude myself from broadcasting
how can I do this ?