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ying liuying liu 

sfdc url

I have a question about sfdc url.
Usually the address is like this : https://cs5.salesforce.com/

I know cs5 is the host.
But when I access visualforce page the url will be changed to https://c.cs5.visual.force.com/apex/test.


Please help me explain what the c. means?

Thanks very much.
ShashankShashank (Salesforce Developers) 
The "c." is common for all visualforce URLs. It doesnt change with host, and is a standard part of the URL for any org on any instance/host.