How HTTP status codes, and network and DNS errors affect Google Search
This page describes how different HTTP status codes, network errors, and DNS errors affect Google Search. We cover the top 20 status codes that Googlebot encountered on the web, and the most prominent network and DNS errors. More exotic status codes, such as 418 (I'm a teapot), aren't covered. All issues mentioned on this page generate a corresponding error or warning in Search Console's Crawl Stats report.
HTTP status codes are generated by the server that's hosting the site when it responds to a request made by a client, for example a browser or a crawler. Every HTTP status code has a different meaning, but often the outcome of the request is the same. For example, there are multiple status codes that signal redirection, but their outcome is the same.
Search Console generates error messages for status codes in the 4xx–5xx range, and for failed redirections (3xx). If the server responded with a 2xx status code, the content received in the response may be considered for indexing.
