so actually you are running the GUI version of the wallet I guess ...
secondly, there are 2 different RPC interfaces .. one of them is for the GUI (which is already up and running just uses different port)
and the RPC API your are currently trying to open the connection to.
further, an RPC interface is not inteded to by opened by the bwowser
try to use 'curl':
curl --data '{"method":"about", "params": [], "json-rpc": 2.0, "id": 0}' http://xeroc:***********@localhost:19988/rpc
However, I have no idea what the right port is in the GUI version of the wallet ..
Also there are already a few RPC related posts on the forum, maybe you should check them out to figure a solution for your problem:
https://bitsharestalk.org/index.php?topic=5562.0