OverviewHTTP response status codes

HTTP response status codes indicate whether a specific HTTP request has been successfully completed. Being aware of, and having at least passing familiarity of the different classes, and common codes is a valuable skill.

Status codes come in five (5) classes

  • 1xx Informational
  • 2xx Success
  • 3xx Redirection
  • 4xx Client Error
  • 5xx Server Error

Informational Responses

These indicate a functional webpage and are generally not often seen in day to day operations. Check Redirects is unlikely to show these status responses.

Reference: Mozilla Developer Network

Successful Responses

Indicate that a response has been a success.

The following are covered in more detail:

Redirection Messages

Further action is required before reaching the destination. These are the most common status codes seen on Check Redirects.

The following are covered in more detail:

Client Error Responses

Errors associated with the client, usually related to the type of data sent in the request.

The following are covered in more detail:

Server Error Responses

These are initiated by the server and may be a result of a request, or could be unrelated.

The following are covered in more detail: