caching - Apache - Add Cache-Control header if not already added -


in apache, how can set response header if not set cgi application?

i need way automatically add cache-control header static content on website, want cgi application able specify own cache-control header too.

setenvif not work purpose because matches request headers.

is there way conditionally / optionally set header if not set?

1) configure apache append value of empty string cache-control header ensure included in response.

2) configure apache set cache-control header if it's still set empty string.

<filesmatch "\.(css|ico|flv|gif|jpeg|jpg|js|pdf|png|swf)$">   header append cache-control ""   header edit cache-control "^[, ]*$" "max-age=1800, public" </filesmatch>

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