Combining variants of "last modified", cache-duration etc

[netzkern_AG]

Hiya,

As you know, you can specify the date of the last change of a document in various places, for example the sitemap, the http-header, ETag and also add an "expected" change, for example Cache-Duration via header/htaccess (or even the changefreq in the sitemap).

Is it advisable or rather detrimental to use multiple variants that essentially tell browser/search engines the same thing? I.e. should I send a lastmod header AND ETag AND maybe something else? Should I send a cache duration at all if I send a lastmod? (Assume that I can keep them correct and consistent as the data for each will come from the very same place.)

Also: Are there any clear recommendations on what change-indicating method should be used?

Thanks for your answers!

Nico

[HiveDigitalInc]

There should be any issue in using multiple methods as long as the data is consistent between them.

Cheers,

Jake Bohall