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From Arnold Maderthaner <>
Subject Re: Issue with TS caching
Date Mon, 03 Oct 2016 11:26:39 GMT
ETag might be used in the future but is not available atm. I can only
use "Cache-Control: no-cache" for the moment.
The question is also why doesn't TS refresh if I send a "no-cache"
request ? shouldn't it by default respect this header value ?

On Mon, Oct 3, 2016 at 1:23 PM, Reindl Harald <> wrote:
> Am 03.10.2016 um 13:18 schrieb Arnold Maderthaner:
>> I have an issue with my TS setup.
>> My use case is that I want to cache images in TS and keep them for a
>> very long time and only go back to origin if needed (which is
>> indicated by the client request).
>> Caching basically works for me if I set
>> proxy.config.http.cache.required_headers=0 as my origin server doesn't
>> supply lifetime values.
>> My issue is that sometimes the images changes and than I need to get a
>> fresh copy from origin.
>> So I tried to use "Cache Control:no-cache" header to obtain a new copy
>> but TS still gives me the old version. I cannot use any time based
>> triggers to obtain a new copy from origin as the images are more or
>> less static (99% of the time) but there are exceptions where the
>> client specifies with the Cache Control header to revalidate the data
>> with origin
> why don't you just define a short expire on the origin since when it's
> reached ATS verifies with the ETAG header from the origin if it needs to
> fetch again and if not the repsonse is just a "304 Not Modified" without any
> body or overhead?
> "keep them for a very long time and only go back to origin if needed" sounds
> like a very broken concept
> <IfModule mod_expires.c>
>  ExpiresActive On
>  ExpiresByType text/css A30
>  ExpiresByType text/javascript A30
>  ExpiresByType application/javascript A30
>  ExpiresByType application/x-javascript A30
>  ExpiresByType text/plain A30
>  ExpiresByType text/xml A30
>  ExpiresByType application/xhtml+xml A30
>  ExpiresByType application/xml A30
>  ExpiresByType image/jpeg A60
>  ExpiresByType image/jpg A60
>  ExpiresByType image/gif A60
>  ExpiresByType image/png A60
>  ExpiresByType text/html A60
>  ExpiresByType text/comma-separated-values A60
>  ExpiresByType text/tab-separated-values A60
> </IfModule>

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