'Override to customize cache control behavior.
Return a positive number of seconds to make the result
cacheable for that amount of time or 0 to mark resource as
cacheable for an unspecified amount of time (subject to
browser heuristics).
By default returns cache expiry of 10 years for resources requested
with ``v`` argument.'

def get_cache_time(self, path, modified, mime_type):

    return (self.CACHE_MAX_AGE if ('v' in self.request.arguments) else 0)
