Andy Tran

HTTP 4xx Status Codes

by | 4 Aug, 2021 | Web Dev | 0 comments

HTTP 4xx Status Codes

HTTP or Hypertext Transfer Protocol is a standard protocol is use for to transfer hypertext documents that make the World Wide Web possible or In simple terms, we can say that HTTP defines messages format and how to send across the web. HTTP 4xx Status Codes are standard response codes issued by a server in response to a client’s request made to the server. All HTTP Status Codes have five classes:

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

Today we are going through 4xx Status Codes indicating that problem has occurred on the client-side.  A 4xx error is an error that arises in cases where there is a problem with the user’s request, and not with the server.

In short, This type of error occurs because when a user’s access to a web page is restrict, the user misspells the URL or when a webpage is non-existent or removed from the public’s view.

4xx status codes are designed to inform a client that there is an issue on their end and there is nothing wrong with the server. For clients who are familiar with these errors, they are use for giving a client a hint as to what they can do to fix the problem.



HTTP status codes essentially provide information on whether a page loaded correctly or not, and if the page isn’t loading correctly then what’s the cause behind this.

While all HTTP status codes have a valid purpose, the 4xx status codes are the ones that you are more likely to encounter. Sometimes error messages can be helpful, according to that error message you can fix HTTP 4xx error messages in different ways.

The most common method is to check the URL to make sure that you haven’t made any spelling mistakes. Clearing cookies and cache can also work in some cases where expired and invalid cookies are used. It is enough to fix a “400 Not Found” error. Refreshing the page, Restarting your computer, confirming your login credentials on the right URL, and simply trying later will help you to avoid most error messages.

However, It’s worth remembering that any disruption to the user experience should be avoid where possible.


  1. Dusseault, Lisa, ed. (June 2007). HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV).
  2. Khare, R; Lawrence, S. “Upgrading to TLS Within HTTP/1.1”
  3. Nottingham, M.; Fielding, R. (April 2012). “RFC 6585 – Additional HTTP Status Codes”
  4. Bray, T. (February 2016). “An HTTP Status Code to Report Legal Obstacles”
  5.  Wikipedia. “List of HTTP status codes – Wikipedia”

Also Read: The Future of Web Application Development: Emerging Trends and Technologies

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