Adrian, sorry but this is not a querry (?) issue. I think Henrik explained why I am not caching. Just in case u did not read his response I repeat for you info: a) The object must have a cache validator (Last-Modified or ETag). If there is no cache validator then the response must be fresh for at least minimum_expiry_time to get cached, this to avoid wasting disk I/O .... This is the exact problem I have that I am trying to resolve, not querry string issues. If only I can overide the lack of Last-Modified, Etag and not meeting minimum_expiry_time conditions. Thanks, solomon. --- Adrian Chadd <adrian@xxxxxxxxxxxxxxx> wrote: > On Tue, Sep 18, 2007, Solomon Asare wrote: > > Hi Henrik, > > thanks for your insightful response. However, the > > object is a .flv file that hasn't changed in > months. > > The origin server certainly doesn't want the > object > > cached, but I want to. Any leads that can help me > > achieve this? > > * set your refresh_pattern's right, you can override > almost all the relevant > headers in there; > * if the URL has a ? in it then you need to look at > the cache/no_cache directives > * if in doubt, compile with the option to log > request/reply headers (I forget > what it is, ./configure --help will tell you) and > take a look at exactly what > headers they're sending back. > > > > > Adrian > > > Regards, > > solomon. > > > > --- Henrik Nordstrom <henrik@xxxxxxxxxxxxxxxxxxx> > > wrote: > > > > > On m?n, 2007-09-17 at 11:55 -0700, Solomon Asare > > > wrote: > > > > Hi Amos, > > > > I am not sure if refresh_pattern is the sole > > > > determinant in caching an object, that is if > it > > > has > > > > any influence at all. > > > > > > It has influence, both directly by assigning > > > freshness information when > > > there is none, and indirectly by overriding > various > > > HTTP controls.. > > > > > > Requirementsto cache stale objects: > > > > > > a) The object must have a cache validator > > > (Last-Modified or ETag). If > > > there is no cache validator then the response > must > > > be fresh for at least > > > minimum_expiry_time to get cached, this to avoid > > > wasting disk I/O for > > > caching content which can not be reused. > > > > > > b) There must not be other headers preventing it > > > from getting cached. > > > refresh_pattern can override most of these if > > > needed. > > > > > > > I am not discussing getting a > > > > HIT for a cached object, but rather caching an > > > expired > > > > object from an origin server. If this object > is > > > > expired, by say 60 seconds before being served > > > from > > > > the origin server, how do I cache it? Date > and > > > > Last-Modified dates are also not set. > > > > > > If there is no Last-Modified and no ETag then > it's > > > useless to cache an > > > expired object, as it can not be reused on any > > > future request and all > > > you get is extra disk I/O for writing the object > > > out. > > > > > > A cache validator (Last-Modified or ETag) is > > > required to be able to > > > verify with the origin server if an expired > object > > > is still valid or > > > not. Without a cache validator there is nothing > to > > > relate to and there > > > is no other choice than to fetch the complete > object > > > again when > > > expired.. > > > > > > Regards > > > Henrik > > > > > -- > - Xenion - http://www.xenion.com.au/ - VPS Hosting - > Commercial Squid Support - > - $25/pm entry-level bandwidth-capped VPSes > available in WA - >
