Hi, thanks for the great module.

Using Google pagespeed, I get the following suggestions to improve:

Enable compression
Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.
https://www.exmaple.com:8080/socket.io/1/jsonp-polling/XcCf8no1QLJDCAPku...

How can I compress the message sent to the client via socket.io?

Thanks in advance.