Jibbering Musings

So we have another blogger mentioning the cost of being popular at least Mark Pilgrim has made some effort to be cacheable, but he could certainly do more and put in some expires, and cache-control headers, he says at the RSS level “my feeds should only be read every 3 hours” - but doesn’t bother saying it at the http level. Adaptative freshness based on Last-Modified seems to be rarely used these days, more explicit checking is needed. Add an Expires and Cache-Control header, and then you might see some difference, Microsofts XMLHTTP object for example will likely not get a resource within its “expires” time, but it would with out one, other libraries are likely similar.