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Tip of the Day
Language: Web
Expertise: Intermediate
Aug 27, 2001



Application Security Testing: An Integral Part of DevOps

How To Ensure That the Page is not Cached

Setting Response.Expires to a negative number or 0 disables caching. Sometimes, the use of Response.Expires = -1 doesn't work because of mismatches between the clocks on the server and the browsers. Be sure to use a large negative number, a little more than a day (1440), to work around those mismatches.

Response.Expire = -1441

Here are the commands to place at the top of your ASP scripts, to ensure that the page is not cached:
<% Response.Expires = 60 Response.Expiresabsolute = Now() - 1 Response.AddHeader "pragma","no-cache" Response.AddHeader "cache-control","private" Response.CacheControl = "no-cache" %>
Camelia Dediu
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