Both Google & Bing Support ETag/If-None-Match http://bit.ly/2AmTwEp Google's John Mueller said Google does support ETag/If-None-Match after this Search Engine Land article shows that Bing supports it. He said it is rare to see sites using it, most use If-Modified-Since instead. John Mueller when asked if GoogleBot supports that ETAG, said last month on Twitter "Last I looked we supported that, though most sites seem to use If-Modified-Since more."
Mozilla has a more technical description of this header. Forum discussion at Twitter. SEO via Search Engine Roundtable http://bit.ly/1sYxUD0 December 28, 2018 at 07:10AM
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