> I have discovered, that an Apache 2.2.3 server sets an
> "Expires" header on our static content.
>
> I suppose Apache won't set the header in a "clean" install,
> but which other module could cause this header?
from modules\http\http_filters.c, line 1008:
/*
* Control cachability for non-cachable responses if not already set by
* some other part of the server configuration.
*/
if (r->no_cache && !apr_table_get(r->headers_out, "Expires")) {
char *date = apr_palloc(r->pool, APR_RFC822_DATE_LEN);
ap_recent_rfc822_date(date, r->request_time);
apr_table_addn(r->headers_out, "Expires", date);
> And how can I avoid it?
from modules\mappers\mod_negotiation.c, line 2929:
/* XXX: Note that we only set r->no_cache to 1, which causes
* Expires: <now> to be added, when responding to a HTTP/1.0
* client. If we return the response to a 1.1 client, we do not
* add Expires <now>, because doing so would degrade 1.1 cache
* performance by preventing re-use of the response without prior
* revalidation. On the other hand, if the 1.1 client is a proxy
* which was itself contacted by a 1.0 client, or a proxy cache
* which can be contacted later by 1.0 clients, then we currently
* rely on this 1.1 proxy to add the Expires: <now> when it
* forwards the response.
*
if ((!do_cache_negotiated_docs(r->server)
&& (r->proto_num < HTTP_VERSION(1,1)))
&& neg->count_multiviews_variants != 1) {
r->no_cache = 1;
}
So apparently, when httpd sends negotiated content to an HTTP/1.0 client, it
adds the Expires header.
Does this apply to your situation?
I just tried "curl -I http://news.dds.dk/uploads/pics/broenonline.gif"; and
this is what I got:
HTTP/1.1 200 OK
Date: Fri, 08 Jun 2007 23:01:45 GMT
Server: Apache/2.2.3 (Debian) DAV/2 SVN/1.4.2 mod_jk/1.2.18
mod_python/3.2.10 Python/2.4.4 PHP/5.2.0-8+etch1 mod_ssl/2
.2.3 OpenSSL/0.9.8c mod_perl/2.0.2 Perl/v5.8.8
Last-Modified: Wed, 05 May 2004 12:01:50 GMT
ETag: "47461f-a32-3102c780"
Accept-Ranges: bytes
Content-Length: 2610
Content-Type: image/gif
Note, HTTP/1.1 request and no Expires header.
Allen
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