Ivan

When we visit a (web) site, it usually send some request to the server. There will be a returned code to indicate the status (etc Successful). This is called the Hypertext Transfer Protocol (HTTP). The current standard is HTTP/1.1 standard (RFC 7231) unless it is stated otherwise.

Below are the list of status codes. They are classified into 5 classes :

  1. 1xx Informational — the request was received, continuing process
  2. 2xx Successful — the request was successfully received, understood, and accepted
  3. 3xx Redirection — further action needs to be taken in order to complete the request
  4. 4xx Client error — the request contains bad syntax or cannot be fulfilled
  5. 5xx Server error — the server failed to fulfil a valid request

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