mod_headers: Don't add a header if it is already present

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Hey everyone,

I'm developing a PHP-based website which was not supplying the correct Cache-Control directives in its responses. Even though most of my pages are generated especially for the user who is requesting them, I was not setting the "Cache-Control: private" response header. As a quick fix, I'm using mod_headers like so:

Header append Cache-Control "private"

However, some new pages I am now developing are cache-aware, and supply their own Cache-Control headers which should not include the "private" modifier. Is it possible for mod_headers to not create this header if the response (from PHP) already includes a Cache-Control header? I could not work anything out with the conditional controls that the documentation mentions for the 'Header' directive, but perhaps I'm just a little dense.

Cheers,
Nicholas Sherlock


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