Google announced that it was sending out notifications to inform publishers that Google has started crawling their websites using the extended HTTP / 2 protocol. The notification will only be sent to those whose websites have been updated.

Why HTTP / 2

HTTP / 2 (also known as h2) is a network protocol that servers, browsers and bots can use to transfer data from a server.

HTTP / 2 is more efficient than the older HTTP / 1.1 protocol and can transfer data faster than the older protocol.

The benefit for publishers is that this results in a lower server load. This means that if Google is crawling a website while the server is busy, there is less chance of an error (such as a timeout error).

An added benefit is that the website can be quickly available with less stress for users accessing the website.

Screenshot http / 2

The announcement that Google was sending communications was made on Twitter by Gary Illyes of Google.

The tweet said:

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“I just hit the button to send a large amount of messages to sites that have been enabled for HTTP / 2 crawling. If something is not clear, follow the link in the message. "

It was accompanied by a screenshot of an example of a note showing what it looks like.

Screenshot http / 2

Another tweet indicated that Googlebot's HTTP / 2 crawling is slow and not all of a sudden online.

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According to Gary:

"The h2 crawler traffic is gradually increasing. It's not as if you received the message and suddenly everything is crawling h2. It may take a few days"

Will Googlebot crawl all eligible websites?

Google determines whether a website will benefit from the new HTTP / 2 crawl. If there is no use, Google may choose not to use the new HTTP / 2 protocol.

According to Google:

“In our reviews, we've found that certain websites (e.g., websites with very low QPS) are of little or no use when crawling over H2. For this reason, we decided to only switch crawling to h2 if there is a clear benefit to the site. We will continue to evaluate the performance gains and may change our criteria for a future switch. "

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Crawling with HTTP / 2 also depends on whether your server is set up for it or not. If you don't know if your site can handle HTTP / 2 crawling, check with KeyCDN.

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