Apache: Disable Cache-Control: max-age?

Question

A book about performance reads that you should use Expires or Cache-Control: max-age but not both .

Expires was easy to configure on my Apache.

Now I would like to disable the unneeded Cache-Control: max-age but I don't how to.

Joe · Accepted Answer · 2015-03-30 08:36:10Z

1

Your mention of both headers suggests that you're using mod_expires. You cannot select only one header using mod_expires. The code that sets the headers in mod_expires.c unconditionally sets both headers to equivalent values:

apr_table_mergen(t, "Cache-Control",
                 apr_psprintf(r->pool, "max-age=%" APR_TIME_T_FMT,
                              apr_time_sec(expires - r->request_time)));
timestr = apr_palloc(r->pool, APR_RFC822_DATE_LEN);
apr_rfc822_date(timestr, expires);
apr_table_setn(t, "Expires", timestr);

However, using mod_header may allow you to set what you want, using something like:

Header unset Cache-Control

There is a case for using both: Cache-Control allows much finer control than Expires, while Expires may help much older clients.

answered Mar 30, 2015 at 8:36

Joe

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1 Comment

Martin Over a year ago

Thanks for the explanation, I will just continue using both.

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