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Why we're making this change
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As we said, it's the next major version of HTTP , the protocol the internet primarily uses for transferring data. In general, we expect this change to make crawling more efficient in terms of server resource usage. With h2, Googlebot is able to open a single TCP connection to the server and efficiently transfer multiple files over it in parallel, instead of requiring multiple connections. The fewer connections open, the fewer resources the server and Googlebot have to spend on crawling. In the first phase, we'll crawl a small number of sites over h2, and we'll ramp up gradually to more sites that may benefit from the initially supported features, like request multiplexing. If your server supports h2 and Googlebot already crawls a lot from your site, you may be already eligible for the connection upgrade, and you don't have to do anything. There's no explicit drawback for crawling over this protocol; crawling will remain the same, quality and quantity wise. You can do that by instructing the server to respond with a HTTP status code when Googlebot attempts to crawl your site over h2. If that's not feasible at the moment, you can send a message to the Googlebot team however, this solution is temporary. If you can't find your question, write to us on Twitter and in the help forums.
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