Playing with Excel Services to compose a dashboard page, I suddenly encountered HTTP 400's on requesting the dashboard page. I monitored the request handling in Fiddler, it showed HTTP Error 400. The size of the request headers is too long. So I inspected the request, and noticed that the Cookie somehow had grown to a very large (string)value:
Pragmatic resolution to fix from the issue is to close all IE instances, and start a fresh IE session. That resolves the issue.
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