Nginx: Use Redirect 301 for legacy paths /sites/default/files/* to /sites/foo.com/files/*
Issue #2161115 - AdvAgg: Strictly follow RFC 2616 14.21 - Set expired date no more than 1 year in the future.
Issue #2199229 by heliogabal - CiviCRM 4.4.4 needs change in nginx conf to prevent access to sensitive information.
Nginx: default value of variables_hash_max_size is too low for recent Nginx version.