monitoring - How do get the 'response time' à lá pingdom,etc?

I just received this report from pingdom:

enter image description here

Ans was wondering how do they know the 'response time' information regarding the site. The GET request does not give that information.

Answer

... was wondering how do they know the 'response time' information regarding the site.

I am not sure what exactly Pingdom does, but the standard seems to be to measure the complete page load time, but without images:

See for example: http://www.alertfox.com/Tools/LoadTime/

"This test measures the response time (HTML load time without images) from three monitoring stations distributed worldwide."

Technically that is the same as http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.aspx

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