A good tool to measure Caching, Size of pages, Authentication and Performance is Fiddler:

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· you can go to https://www.fiddler2.com to get the tool and then:

· Training: https://fiddler2.com/Fiddler/help/ - I watched the demonstration videos, which were helpful

· Fiddler PowerToy - Part 1: HTTP Debugging: https://msdn2.microsoft.com/en-us/library/bb250446.aspx

·  Fiddler PowerToy - Part 2: HTTP Performance: https://msdn2.microsoft.com/en-us/library/bb250442.aspx

· see https://httpweb for some more details on the status codes