From: Dominic Sisneros <dom@...>
Date: 2005-04-28T15:49:20+09:00
Subject: Re: CGI question

|From rails wiki => http://wiki.rubyonrails.com/rails/show/HowtoSendFiles

def http_if_modified_since?(path)
        if since = @request.env['If-Modified-Since']
            begin
                require 'time'
                since = Time.httpdate(since) rescue Time.parse(since)
                return since < File.mtime(path)
            rescue Exception
            end
        end
        return true
    end
end|



Matt Taylor wrote:

>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
>
>  
>