Need to add expires header conditionally based on mime types

Server NGINX
1

Hi

I need to add expires headers conditionally based on a certain mime
type.
For example add expires 7d to text/css

How to do this ?

So far I found that $sent_http_content_type contains the mime type that
is
send in http response. But its not possible to put it in a if directive
and
do expires
either,

if ($sent_http_content_type = “text/css”)
{
expires 7d;
}

will not work.

Also tried to create a map and try to hack around, but could not do it.

I cannot do on file based or specific directory location based because
lots
of css/js content is generated from php files dynamically. And there are
multiple php files generating content.

I need a neat way to implement this, is it possible ?

2

Hi Silver,

this will fit your needs:

location ~* .(js|css|png|jpg|jpeg|gif|ico)$ {
expires 7d;
}

Simon
Am 13.06.2013 14:26, schrieb Silver Moon:

3

hi

this is not sufficient.

in my application for example, js, css and images are generated
dynamically
from php scripts. and there are multiple scripts to generate such
content.

therefore i need mime based expire headers.

On Fri, Jun 14, 2013 at 12:23 AM, Simon Hnscheid <

4

Are they presented as .js, .css etc to the client browser?

If so, then this is sufficient.

Steve

On Fri, 2013-06-14 at 08:28 +0530, Silver Moon wrote:

    }
    >
    > }
    > there are multiple php files generating content.
    > [email protected]

–
Silver

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Steve H. BSc(Hons) MNZCS

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Skype: sholdowa

5

yes, i could send out headers from php itself
but mime based header generation in the webserver itself would make
things
easier.

so finally it is impossible to achieve that ?

6

From what you describe I do think the suggested nginx config is
enough…

However maybe you’re looking for something like this:

Not really sure if it suits you’re needs, but It seems this is what
you’re looking for.

You can also find more info on mime type here:
http://wiki.nginx.org/HttpCoreModule#types

Hope this helps,

Mike

7

If you handle your js, css and images by php scripts you can use header
function to send out Expires and Cache-Control directives

example:

<?php header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1 header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past ?>
8

the

putting $upstream_http_content_type or $sent_http_content_type or
$content_type inside “if” does not work.
i wish someone could test and provide a working example.

none of the samples shown in the stackoverflow post work.

i tested enough and found that only $sent_http_content_type contains
the
http response Content-type
and that can be tested like this

add_header TEST $sent_http_content_type

however putting that inside an if and trying to add further headers
inside
that if will not work
i opened a ticket in trac and they said that it does not work like that

however no one confirms if it is strictly possible or impossible.

9

If you use the Lua embedded module you can do that AFAICT.

Le 14 juin 2013 05:42, “Silver Moon” [email protected] a crit :