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For those of you iterested in the details of IWA, I'll walk you throuh the HTTP headers of a web browser connecting to http://glast-ground.slac.stanford.edu/ so that you can see how the cyptographic exhage works. In each of the following diagrams, the HTTP header sent by the browser to the remote web serveris sown server is shown first, followed by the remote web server's response back to the browser.
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