Re: best practices on setting HTTP headers and status codes

You don't have to use plone.app.caching for everything IMO. In many cases,
I do custom cache headers in views. Seems like a fine thing to do to me...

On Thu, Sep 11, 2014 at 4:17 PM, Sean Upton <[email protected]> wrote:

> On Thu, Sep 11, 2014 at 2:55 PM, Héctor Velarde
> <[email protected]> wrote:
>
> > what I want is to return a 304 status code if the view has not changed
> since
> > the last time the client got it. as I want to be a good citizen, I want
> to
> > handle this with and without proxies (Varnish).
> >
> > to solve this problem I'm handling the "If-Modified-Since" request header
> > and, while working on that, I found some code in different parts of the
> > Plone core code that handles similar situations; an example, for images,
> can
> > be found here:
>
> I am sure I have not thought this through entirely, but could you set
> the Vary header in the response for the If-Modified-Since request
> header?  OTOH, that may have the practical effect of making cache hits
> pretty unlikely.
>
> One alternative: leverage traversal semantics by making your view
> provide IPublishTraverse, where you have a URL path like this:
>
> /path/to/liveblog-post/@@since/2014-09-12T15:20
>
> Making YourView.publishTraverse() do the fun work of parsing the
> ISO8601 stamp, and setting internal datetime.datetime attribute on the
> view object, then having the YourView.__call__() method calculate and
> return the result.
>
> Then you have a URL you don't have to worry too much about headers for
> re: caching?  If you do this on a one-minute granularity, high traffic
> ought to leverage Varnish HITs (but even then, maybe you can make the
> caching interval configurable to more or less granular).
>
> Sean
>
>
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-- 
Nathan Van Gheem
Solutions Architect
Wildcard Corp

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