On Tue, Apr 13, 2010 at 1:13 PM, Jonathan Zuckerman <j.zuckerman@xxxxxxxxx> wrote: > > > On Tue, Apr 13, 2010 at 12:13 PM, Brian Mearns <mearns.b@xxxxxxxxx> wrote: >> >> On 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 >> >> >> >> -- >> >> Feel free to contact me using PGP Encryption: >> >> Key Id: 0x3AA70848 >> >> Available from: http://keys.gnupg.net >> >> >> >> --------------------------------------------------------------------- >> >> The official User-To-User support forum of the Apache HTTP Server >> >> Project. >> >> See <URL:http://httpd.apache.org/userslist.html> for more info. >> >> To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx >> >> " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx >> >> For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx >> >> >> > >> > 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.. >> >> The reason is just to optimize caching. I guess the ETag doesn't >> 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 >> >> >> -- >> Feel free to contact me using PGP Encryption: >> Key Id: 0x3AA70848 >> Available from: http://keys.gnupg.net >> >> --------------------------------------------------------------------- >> The official User-To-User support forum of the Apache HTTP Server Project. >> See <URL:http://httpd.apache.org/userslist.html> for more info. >> To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx >> " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx >> For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx >> > > check out http://httpd.apache.org/docs/2.0/mod/core.html#fileetag > If you can't get what you want with that, my personal opinion is that the > performance gained by your request would not justify the amount of time > required to develop it. Thanks for the reference. The FileEtag directive is not as strong as what I'm looking for. I understand your sentiment about it not being worth the effort: but development effort is temporary, performance improvements are forever =). -Brian -- Feel free to contact me using PGP Encryption: Key Id: 0x3AA70848 Available from: http://keys.gnupg.net --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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