sitemaps.xml: Allow gzip support, cache?

[sminnee]

From http://open.silverstripe.org/ticket/1646 - see there for more discussion

Google's suggestion in the sitemaps protocol is to provide it as a .gz file, and not just as an .xml file carried over mod_deflate.

Enable support for accessing /sitemap.gz (or is sitemap.xml.gz?)

This will increase the CPU load for producing the sitemap, and so it would be best for this to be cached, say to /assets/.sitemap.xml.gz

E.g.

if (cachefile < 1 hour old OR ?flush=1 ) create-xml-file-and-save-to-gzipped-cache-file()

header temporary redirect to cache file()

Does the protocol support putting a comment inside the xml file to say the generation time?

[dhensby]

+1