boto/boto — pull request #468 by najeira (2012-01-11 02:19:03+00:00)
Title: Added option `expires_in_absolute` to S3's `generate_url` method.

When that option is setted True, `expires` treat as absolute time.
Default value is False for compatibility.

I want to use absolute time on `generate_url`.

Relative `expires` will change url every generation.
Browsers does not use cache if url was changed,
because there are anothrer resouces.

Fixed url make browser caching more effective.
You can use fixed url on using `expires_in_absolute` with True.