This is especially true for when the application protocol on the same connection is being used.

Real World SEO Application: None 101 – Switching Protocolsĭefinition: The originating server of the site understands, is willing and able to fulfill the request of the client via the Upgrade header field. 100 – Continueĭefinition: In general, this protocol designates that the initial serving of a request was received and not yet otherwise rejected by the server. These codes are informational in nature and usually have no real-world impact for SEO.

5xx are any codes that fail to load due to a server error.

4xx are any codes that fail to load on the client side, or client error codes.

1xx status codes are informational codes.

These codes are segmented into different types: If you are working on an audit, other status codes can be a mystery, and further digging may be required. These codes can become complex, often turning into a hard puzzle that must be solved before other tasks can be completed.įor instance, if you put up a page that all of a sudden disappears with a 404 not found status code, you would check server logs for errors and assess what exactly happened to that page.

One of the most important assessments in any SEO audit is determining what hypertext transfer protocol status codes (or HTTP Status Codes) exist on a website.

5xx server error