Hi, This patch simply add ETag[1] support for all our string responses. Suppose of this is to give client an option to check if response was changed or not (like for checking instance status) without parsing XML.
Another thing which this patch add is X-Runtime and X-Backend-Runtime headers, where you can find timings or request and also timing of 'backend' operation (mean how long takes to get response from backend) This patch could be used for performance benchmarks... -- Michal [1] http://en.wikipedia.org/wiki/HTTP_ETag
