HTTP Response Status Codes: Client Error (400–499) — Grow Together By Sharing Knowledge

Sandeep Agrawal
2 min readAug 8, 2023

HTTP response status codes are crucial in web development, providing valuable insights into the outcome of a client’s request.

In our previous blog posts, we explored Informational Responses (100–199), Successful Responses (200–299), and Redirection Responses (300–399), learning how they establish communication, indicate success, and handle redirects.

Now, let’s dive into the fourth class of HTTP response status codes — Client Error Responses (400–499). These codes signify that the client’s request contains errors or cannot be fulfilled. Join us as we explore each of these client error responses in detail.

Table: HTTP Response Status Codes — Client Error Responses

Client error responses (status codes 400–499) indicate that the client’s request contains errors or is not valid for some reason. These codes are essential for identifying and diagnosing issues with client-side requests. When handling these responses, developers should provide clear error messages and guide users towards resolving the issues.

Next, we’ll explore Server Error Responses (500–599), which indicate that the server failed to fulfill a valid request. Happy coding!

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Originally published at on August 8, 2023.