IIS 7.5 How do you add a Dynamic HTTP Expires Header

Question

In IIS 7.5, you can add static HTTP Response headers, but I want to add an \"Expires\" header that always specifies a date that is 7 days in the future.

I\'m running

Answer 1

You can only add dynamic expires header using program code.

Source: The Microsoft IIS Site

You should use Cache-Control max-age instead, like suggested in the other answer.

Answer 2

This is a standard feature of IIS. The HTTP Response Headers module allows you to set this common header. This results in the following web.config:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <staticContent>
            <clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="7.00:00:00" />
        </staticContent>
    </system.webServer>
</configuration>

You should do this only in the directories where you want this header to be send. Typically only directories with static content.