Hi,
The serviceGuid and other parameters are removed from the URL because of security issues.
Currently, you have two options to get the serverGuid:
1. Using the deprecated WEB_PLATFORM.getUserSession() -> please look at the "globalview sample" from 6.5U1 SDK
2. Using getUserSession() JAVA API in your backend code -> look at the service part of "html sample" from 6.7 SDK
Regards,
Denis