A Comprehensive Guide to HTTP Status Codes and Their Meanings

In the dynamic realm of web development, understanding HTTP codes is paramount for troubleshooting and optimizing web applications. This blog post delves into HTTP status codes, exploring their subcategories and shedding light on their nuanced meanings.

http status code explained

Introduction to HTTP Codes

HTTP status codes are three-digit numbers that indicate the success, failure, or other status of a requested operation. They are grouped into five categories: Informational (1xx), Successful (2xx), Redirection (3xx), Client Errors (4xx), and Server Errors (5xx).

Informational (1xx)

  • 100 – Continue: The server has received the request headers and the client should proceed with the request.
  • 101 – Switching Protocols: The server is changing protocols, and the client should switch to the specified protocol.

Successful (2xx)

  • 200 – OK: The request was successful.
  • 201 – Created: The request was successful, and a new resource was created.
  • 204 – No Content: The server successfully processed the request, but there is no content to send.

Redirection (3xx)

  • 301 – Moved Permanently: The requested page has been permanently moved to a new location.
  • 302 – Found (Moved Temporarily): The requested page has been temporarily moved to a different location.
  • 304 – Not Modified: The client’s cached copy is up-to-date.

Client Errors (4xx)

  • Client Errors (4xx)
  • 400 – Bad Request: The server cannot understand the request.
  • 403 – Forbidden: The client does not have permission to access the requested resource.
  • 404 – Not Found: The requested resource could not be found.

Server Errors (5xx)

  • 500 – Internal Server Error: A generic error message indicating an unexpected condition.
  • 502 – Bad Gateway: The server, while acting as a gateway or proxy, received an invalid response from the upstream server.
  • 503 – Service Unavailable: The server is not ready to handle the request.

Also have a look at : Difference between URL, URI, and URN – A Complete Guide


In conclusion, mastering HTTP codes is pivotal for web developers and administrators. A solid understanding of these status codes empowers you to diagnose issues, enhance user experience, and ensure the smooth functioning of web applications.


Why do we need HTTP status codes?

HTTP status codes provide a quick and standardized way for servers to communicate the outcome of a request to clients, aiding in troubleshooting and improving user experience.

How do I troubleshoot a 404 error?

A 404 error indicates that the requested resource is not found. Check the URL, ensure the resource exists, and inspect server logs for additional details.

What is the difference between 301 and 302 redirects?

A 301 redirect is a permanent redirect, while a 302 redirect is temporary. Choose the appropriate status code based on the nature of the redirection.

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