Re: [Zope-dev] Last-modified and bobobase_modification_time

Wei He writes:

... 2. From the website developers' point of view, there are already many guidlines on how to create a good webpage. Among them are using the HTTP Last-modification header to take the advantages of client cache. I think you overestimate the importance of accurate "Last-Modified" headers.

In order for caching to be allowed, there must either be a "Last-Modified" or (alternatively) an "Etag" header. However, the value of the "Last-Modified" is almost irrelevant for caching. I think, it is only used when a HTTP cache validates on object, in that is uses this date in an "If-Modified-Since" request. I would use "Expires" and "Cache-Control" for cache control. Dieter