The reason is just to optimize caching. I guess the ETag doesn'tOn Tue, Apr 13, 2010 at 10:49 AM, Jonathan Zuckerman
<j.zuckerman@xxxxxxxxx> wrote:
> On Tue, Apr 13, 2010 at 10:34 AM, Brian Mearns <bmearns@xxxxxxxx> wrote:
>>
>> I'd like to use stronger and correlated ETag, namely the hash of the
>> content being served. Obviously it's a drag to do this in-line, so I'm
>> planning an automated task to generate the ETag values and store them
>> on the server. Is there any way I can get httpd to grab these stored
>> values for use in the Etag header? I'm flexible on how I store them:
>> in a database, in one large file, each in its own file named according
>> to the resource, etc.
>>
>> Any ideas?
>>
>> Thanks,
>> -Brian
>>
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>
> I have some "static" content that's actually built dynamically on the server
> (it's just a concatenated, minified JS or CSS file), and therefore can't use
> Apache's default etags/expires headers which I believe only apply to real
> files, so I do the same thing you're suggesting, in php.
> I would much rather let Apache take care of this for me, but my obsessive
> and orderly mind demands that I keep the _javascript_ and CSS that applies to
> different parts of the site in different files, and my background in
> high-load high-availability web-serving makes me want to keep the number of
> http requests down.
> So my question to you is, what is your reason for wanting to do this, and
> how would you implement if it did exist? It's pretty trivial to do it with
> a scripting language that can alter response headers, if in fact it's really
> necessary..
really need to be any stronger than the built-in, but I would like it
to be correlated, meaning if the content hasn't actually changed, or
has changed and then changed back, it will have the same ETag even
though the last-mod time is different.
I'm not sure exactly what you mean by how I would implement it. In
terms of generating the ETag values? For true static content, I would
just hash the file. For PHP, for instance, I would filter it through
`php -w` first, and hash the result. Like I said, I'm not sure exactly
how I will store the generated values, it depends on how I'm actually
getting the values in the headers. I would use either a cron job or a
publishing-script to update the stored ETags.
I have done this before in PHP, but I'd hate to have to serve static
content through a wrapper PHP script just to put an ETag header in
there.
Thanks,
-Brian
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