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From "Craig R. McClanahan" <>
Subject Re: Patch to bug #345 complete ?
Date Mon, 20 Aug 2001 17:54:43 GMT
On Mon, 20 Aug 2001, Justin Erenkrantz wrote:

> On Mon, Aug 20, 2001 at 10:24:01AM -0700, Henry Yeh wrote:
> > 
> > yes. I analyzed the HTTP header that's being sent and received by the
> > browser.
> > If-Modified-Since messages are sent to tomcat, and we are dealing with
> > static files here (javascript and images). 
> > So is tomcat doesn't have the '304 behavior' for static files ? It does
> > send back 'last-modified' date information in the header, and that ALWAYS
> > matches the 'If-modified-since' date. Are we looking at another tomcat 
> > date bug here ?
> It's more of a feature that was never written.  Tomcat has no code to
> handle If-Modified-Since (based on a quick grep through the source 
> code - I could be wrong).  You are welcome to write the code and apply 
> it locally.  I'm not sure if it'll make it into the 3.x branch as I 
> think it is frozen.  4.x is a possibility for inclusion, however.  (I 
> seem to remember that you are using 3.x.)
> However, you'll have to be aware that jsp's and servlets must ignore 
> If-Modified-Since headers so the implementation can be tricky.  

I'm not sure I would make quite so blanket a statement as that.  If the
servlet itself understands that the content it produces changes rarely, it
can improve performance by respecting If-Modified-Since values.  To make
this worthwhile, though, it will also need to control the value sent for
the "Last-Modified" header, which you can do by overriding the
getLastModified() method of HttpServlet.

> -- justin

For what it's worth, Tomcat 4 stand-alone already correctly handles
If-Modified-Since headers, and sends back "not modified" responses


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