On 12/05/2011 04:06 AM, Nick Kew wrote:
On 5 Dec 2011, at 02:27, Dennis Jacobfeuerborn wrote:
FilterProvider testfilter TESTFILTER "%{CONTENT_TYPE} = 'text/html'"
FilterProtocol testfilter change=yes,cache=no
FilterChain testfilter
FilterProtocol is slightly half-baked: filter modules should tell mod_filter
their protocol details when they register the filter instead.
But still, the above *should* cause it to set Cache-Control: no-cache
on requests where the filter is invoked (are you sure it is?)
These are the response headers I get with the request:
Connection Keep-Alive
Date Mon, 05 Dec 2011 11:51:13 GMT
Etag "35d2-2d-432a5e4a73a80"
Keep-Alive timeout=5, max=97
Server Apache/2.3.14 (Unix) mod_ssl/2.3.14 OpenSSL/1.0.0-fips DAV/2
On the request itself I see these cache relavant headers:
Cache-Control max-age=0
If-Modified-Since Mon, 11 Jun 2007 18:53:14 GMT
If-None-Match "35d2-2d-432a5e4a73a80"
The filter itself works fine but the problem is that despite specifying
cache=no which according to the documentation should render the output
uncacheable when I reload the page I only get a 304 Not Modfied response.
If your browser sends a conditional request then the server might send a 304
without reference to any filters. The cache=no option just sets the header
when the filter is invoked.
The filter inserts a header and a footer in the page from two files. I can
modify these files and don't see an update when I reload but I *do* see an
update when I shift+reload. So the filter definitely gets invoked.
I get the desired behavior when I add the following to the server config:
Header Set Cache-Control "max-age=0, no-store"
The "no-store" is key here and without it I see the 304's again.
I do not see any headers in the response that actually tell the browser that
the content is uncacheable.
Any ideas what might be going on here?
Is anything going on that might cause an internal redirect?
For example, mod_alias, mod_rewrite, mod_negotiation, any error,
or anything concerning trailing slashes or directory indexes?
Or a subrequest, as in SSI?
Not that I know of. This is a new virtual machine that just has the naked
default apache 2.3.14 installed (not 2.3.15 yet as indicated in the
subject, I will update that later today).
The DocumentRoot is /var/www/htdocs which contains an index.html with the
content "<html><body><h1>It works!</h1></body></html>" which apparently
comes with the apache source.
The directory index is the only thing that might be involved here but I
also tested this by explicitly calling /index.html with the same result.
So right now the whole setup is pretty much as minimal as it gets without
any aliases, rewrites, etc. involved.
Regards,
Dennis
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