From the Google Webmaster Central Bolg
Posted on 26th Jan 2015
Webmaster level: advanced
Locale-adaptive pages change their content to reflect the user’s language or perceived geographic location. Since, by default, Googlebot requests pages without setting an Accept-Language HTTP request header and uses IP addresses that appear to be located in the USA, not all content variants of locale-adaptive pages may be indexed completely.
Today we’re introducing new locale-aware crawl configurations for Googlebot for pages that we detect may adapt the content they serve based on the request’s language and perceived location. These are:
- Geo-distributed crawling where Googlebot would start to use IP addresses that appear to be coming from outside the USA, in addition to the current IP addresses that appear to be from the USA that Googlebot currently uses.
- Language-dependent crawling where Googlebot would start to crawl with an Accept-Language HTTP header in the request.
As these new crawling configurations are enabled automatically for pages we detect to be locale-adaptive, you may notice changes in how we crawl and show your site in Google search results without you altering your CMS or server settings.
Note that these new configurations do not alter our recommendation to use separate URLs with rel=alternate hreflang annotations for each locale. We continue to support and recommend using separate URLs as they are still the best way for users to interact and share your content, and also to maximize indexing and better ranking of all variants of your content.