I've dug around and found the following but where not particularly useful (and why) - Does GridGain support SSL connection between each cluster member? was this wasn't so much useful as it didn't give much information on actually running and using the client - http://atlassian.gridgain.com/wiki/display/GG60/HTTP+Client unlike other parts of the documentation which comes with examples, the GridGain docs for HTTP REST client just shows you the fields and its properties
What I am trying to do: I have a cluster over a virtual network running on separate virtual machines. I wish to set up a REST service so that I can hit an endpoint to store data. ie. curl POST to localhost:8080/store/ with a parameters object (or some variation of this situation, so long as I can do it over HTTP) and have that data stored into the GridGain cache