Remove pre-check and post-check from Cache-Control
If both `post-check` and `pre-check` are specified and set to `0`, bothare entirely ignored:
http://blogs.msdn.com/b/ieinternals/archive/2009/07/20/using-post_2d00_check-and-pre_2d00_check-cache-directives.aspx
Remove pre-check and post-check from Cache-Control
If both `post-check` and `pre-check` are specified and set to `0`, both
are entirely ignored:
http://blogs.msdn.com/b/ieinternals/archive/2009/07/20/using-post_2d00_check-and-pre_2d00_check-cache-directives.aspx