[Zope-dev] Etag support in page templates

[Bjorn Stabell]

Dieter wrote:
> Please read the HTTP 1.1 spec...
> 
>   Caching requires either an "ETag" or "Last-Modified" header.
>   For good reasons...

That would explain why it never got "fixed", but that's not how I
understand the RFC: http://www.w3.org/Protocols/rfc2616/rfc2616.html

http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.21
http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.2
Indicates that "Expires" is enough to make content cacheable, and that
it should be considered "fresh" until its expire time unless clients or
servers use cache-control headers to force a revalidation.

Last-Modified and Etag are used to validate the content after it expires
using If-Modified-Since and If-None-Match respectively.

Is there a thread discussing this already somewhere?

[ Btw, Zope does return an empty Etag header; does that cause any
confusion? ]

Bye,
-- 
Bjorn