Last-Modified

This new version of SecureMedia. php handles the creation and sending of ETag and Last-Modified headers, enabling browsers who request multiple copies of the same game to use their own cache, therefore saving the web server a great deal of bandwidth.

Suttree; Secure Media; Prevent flash games from hotlinking. 2010

An update to Florian Metzger's SecureMedia. php class that prevents hotlinking to Flash game and now adds support for ETag and Last-Modified headers, otherwise known as conditional-GET, to help reduce the bandwidth usage by allowing for caching of secured games.

Suttree; code 2009

Backup and replace SecureMedia. php with this copy to enable the ETag and Last-Modified headers.

Suttree; Secure Media; Prevent flash games from hotlinking. 2010

On every request it can then compare the resulting ETag to what's in the database, and if it's the same, use the Last-Modified time stored in the database; if not, update the database to the present date and then use that for the Last-Modified.

Snell-Pym » HTTP caching 2007

Now, Wordpress generates both a Last-Modified and an ETag on its RSS feeds; when I get a moment, I'm going to figure out why it doesn't do this for the HTML pages, too, and see if I can fix it...

Snell-Pym » HTTP caching 2007

Generating a Last-Modified header automatically is a bit trickier.

Snell-Pym » HTTP caching 2007

But it's not a great solution; as well as expiry-time based cache headers, HTTP also supports validation, whereby a page can emit a Last-Modified and/or ETag header, which both change when the underlying content changes; then clients can check to see if there's a new version available with a request containing an If-Modified-Since header.

Snell-Pym » HTTP caching 2007

This would enable automatic generation of Last-Modified headers, and subsequent ability for template handlers to handle conditional HTTP requests, thus making caching more effective.

Snell-Pym » A design for a Scheme web application framework 2007

It really desperately needs these couple of issues fixed, though – import most of all and Last-Modified compliance nearly as badly.

Shrook V071 2004

Another huge operational problem – I can tell by watching my server logs when it checks my own blog that it is not using the Last-Modified header.

Shrook V071 2004