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What is HTTP/2
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.
Why we're making this change
For online works, you apply a Creative Commons license to a work by selecting the license that suits your preferences. Once you have selected your license, and if you are applying it to an online work, follow the instructions to include the html code in your work. This code will automatically generate a license button and a statement that your work is licensed under a Creative Commons license, or a CC0 or public domain button if you choose to dedicate your work to the public domain or certify that a work is in the public domain via one of our public domain tools. These buttons are designed to act as a notice to people who come in contact with your work that your work is licensed under the applicable Creative Commons license or is in the public domain. The html code will also include the metadata that enables your work to be found via Creative Commons-enabled search engines.
Effective date : Although having access to such large volumes of electronic data can be very beneficial for users, it is not without its problems. One such problem is that it remains difficult for users to find the specific electronic data they are looking for. For example, users may encounter situations where they access several different applications to find the specific electronic data they are looking for. This usually involves asking users to run different applications, navigating to the search interfaces of different applications, and entering the same search terms into each of the different applications.