From: Matt Taylor <mtaylor@...>
Date: 2005-04-23T05:00:02+09:00
Subject: CGI question

Hi,

Rather new to ruby.  Making my first rails app.

The application is a simple gallery image viewer.

I'm wanting of course to have the browser cache as much as possible.

I'm looking at using etags and If-Modified-Since so I can return a 304
instead of pushing the entire image back to the browser.

putting the etag in the headers for the response is no problem

@response.headers["ETag"]=@image.etag

The thing I can't seem to figure out though is how to tell if the
browser is sending the 'If-Modified-Since' directive.

The stock CGI class seems to have no notion of such a thing and I'm
going nuts trying to figure out how to get access to the raw CGI
environment (ENV seems to be blank, perhaps a security feature?)

Thanks in advance for any help.

Matt

P.S. I tried to join the rails mailing list but so far it doesn't seem
to be working.  Is that list still valid?  -M

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