Home Knowledge base Tips and Tricks Unraveling Common HTML Error Codes....

The communication protocol HTTP defines a list of HTTP codes. These codes consist of three-digit numbers. Most codes correspond to a specific type of error, while a few correspond to a type of success. These codes are sent by the HTTP server to the HTTP client, enabling the client to automatically determine the success of a request or, if unsuccessful, to identify the type of error.

  • 400 Bad Request:
    • The server cannot or will not process the request due to a client error.
  • 401 Unauthorized:
    • The request has not been applied because it lacks valid authentication credentials.
  • 403 Forbidden:
    • The server understood the request, but it refuses to authorize it.
  • 404 Not Found:
    • The requested resource could not be found on the server.
  • 500 Internal Server Error:
    • A generic error message indicating that the server encountered an unexpected condition that prevented it from fulfilling the request.
  • 503 Service Unavailable:
    • The server is not ready to handle the request. Common causes include a server that is down for maintenance or is overloaded.


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