boto/botocore — pull request #162 by garnaat (2013-10-19 17:07:54+00:00)
Title: Refresh timestamp for each signing event for SigV4

We are creating a timestamp in the SigV4Auth class but this causes problems if you hold onto an endpoint for more than five minutes or so. The timestamp expires and the signature is rejected. We need to create a new timestamp each time add_auth is called. But we also need a way to pass in a timestamp to use for the unit tests. This fixes #149.