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Google will crawl your sitemap anyway but will use the Modified Since header info to update the cached version of the page


Your question, as found in the title, is a bit confusing. I am not entirely sure you are trying to modify HTTP headers or just the Last Modified date in your sitemap. You should update the Last Modified date in the sitemap when ever your other sitemaps are updated. While no-one can say if search engines check this date of just check the header date, I ...


If the only difference between the desktop version and mobile version of your site are only graphics related (such as any color or image changes), then making a sitemap for each site is pointless since the content (which google defines as webpage text) is the same on both versions of each page. In this case, make a sitemap for the desktop version of the ...


Actually you should include sitemap in sitemap if you have lots of URLs. You can provide multiple Sitemap files, but each Sitemap file that you provide must have no more than 50,000 URLs and must be no larger than 10MB (10,485,760 bytes). If you would like, you may compress your Sitemap files using gzip to reduce your bandwidth requirement; however ...

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