What are HTTP status codes?

When a user visits a website, a request is sent via the user’s browser to the website’s server. The server receives the request and responds with a three-digit code known as the HTTP Status Code of the page.

HTTP stands for Hypertext Transfer Protocol. It's the protocol used by clients and servers to communicate and exchange data. These status codes are also called as response status codes.

Five Common Classes of HTTP Code are -

• 1xxs – Informational responses: Requests are processed and evaluated

• 2xxs – Success! Request is successfully completed, and the server provided the browser the expected response.

• 3xxs – Redirection: The request was received, but there’s a redirect of some kind and retrieved information is closely relevant to user’s query (but not exact)

• 4xxs – Client errors: Page not found. The site or page couldn’t be reached.

• 5xxs – Server errors: Failure. A valid request was made but the server failed to complete the user’s request.

The comprehensive list of HTTP status codes is presented in the table below -

*Please note that the most used HTTP status codes in SEO are highlighted in GREEN