Google has published a new help document explaining how different HTTP status codes affect how a site appears in search results.

A recent tweet suggests Google’s Gary Illyes had a hand in putting this document together.

This is the new guide to reference when you’re unsure how a particular status code impacts SEO.

Let’s take a look at what’s included in Google’s new guide for site owners and developers.

Much of this may be familiar to you already, but it couldn’t hurt to refresh your knowledge of status codes with the most recently available information.


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How HTTP status codes affect Google Search

Google’s new document covers the top 20 status codes that Googlebot encounters on the web, and the most prominent network and DNS errors.

HTTP status codes are generated by the server hosting a site when content is requested by a browser or crawler.

For example, if a browser requests content that’s no longer hosted on the server, then a 404 (not found) status code will be generated.

The first number of the status code indicates what category it belongs to. All 2xx codes refer to successful crawling, all 3xx codes refer to redirects, and so on.


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Rather than going through all 20 status codes I’ve pulled together the key takeaways for each category.

HTTP 2xx (success)

These codes mean Googlebot can crawl the content and pass it on to the indexing pipeline.

Google makes a point of noting that an HTTP 2xx status…

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