Based on my limited understanding of this parameter [1] it seems to be used in representing cookieless session IDs in java applications... but strangely, we're now noticing that a 3-year-old .NET stack is now appearing in Bing SERPs with GXHC_gx_session_id appended to the domain - and we're not alone:
- http://www.bing.com/search?q=GXHC_gx_session_id
- http://www.google.ca/#hl=en&q=GXHC_gx_session_id
When comparing Google SERPs to Bing SERPs there are some inconsistencies in whether a particular site carries this parameter - is it then a bing-specific issue only?
What else could cause this parameter to be appended to indexed URLs if the target environment (anything behind the load balancers) isn't running java?