Google has enabled language adaptive web crawl and index into processing(from News)

From the official Google blog said Googlebot introduced a new language perception fetching configuration, specially used for scraping content according to the requestor's language and detected by geographical location and adjust the web page.

Specific configuration is as follows:Based on the geographic location of the grab: in addition to the IP address of the Googlebot currently used in the United States, Googlebot will also begin to use the IP address of the located outside the United States.Based on Language fetching: Googlebot will start to use the HTTP header contains the Accept - Language when fetching the request.

System will automatically to detect the language of the adaptive web enable these new fetching configuration, so you may notice that our way of fetching and your site in Google search results show that the effect will be changed (you don't need to change your own CMS or server Settings).

Advice still apply: for each language with rel = alternate hreflang annotation separate url.We will continue to support and suggested to use a separate web site, because it is still the best way to attract users interaction and share content, but also can let you all content version of indexed as far as possible and get higher search rankings.

Further reading:

This command seems to be very little online discussion, HTML tags in the hreflang attribute indicates linked documents are written in simplified Chinese.

Suppose you have an English web address is http://www.example.com/, there is a Chinese version is http://cn.example.com/, you can now use two ways to tell Google the relationship between these two pages:

The HTML link element: in http://www.example.com/ web page, add the following tag element, point to the Chinese web page:

<link rel="alternate" hreflang="es" href="http://es.example.com/" />

HTTP head: if you release is HTML files, such as PDF, then you can use the HTTP headers to tell Google different language of the web page address: 

Link: <http://es.example.com/>; rel="alternate"; hreflang="es"

In your language a web URL must also point to other languages, all the links in the web page must use each other in language point to other languages address:

rel="alternate" hreflang="x"

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