🌐

HTTP Status Code Reference

Look up HTTP status codes and their meanings

1xx Informational

2xx Success

3xx Redirection

4xx Client Error

5xx Server Error

Related Tools

About This Calculator

HTTP status codes are three-digit numbers returned by servers to indicate the result of a client request. This reference tool provides a complete, searchable catalog of all standard HTTP status codes organized by class: 1xx informational, 2xx success, 3xx redirection, 4xx client error, and 5xx server error. Each code includes its official name, a plain-English explanation of when it is returned, common causes, and developer troubleshooting tips. Understanding status codes is fundamental for debugging API integrations, configuring web servers, handling errors gracefully in applications, and diagnosing SEO crawl issues. Bookmark this as a quick reference for the codes you encounter daily.

How to Use

1
Search or browse
Enter a status code number or browse by category (1xx-5xx).
2
Read the details
View the status name, description, and common use cases.
3
Use in your project
Apply the correct status code in your API or server response.

Frequently Asked Questions

Q. What is the difference between 301 and 302 redirects?

A 301 is a permanent redirect — search engines transfer ranking authority to the new URL. A 302 is a temporary redirect — search engines keep the original URL indexed. Use 301 when a page has permanently moved; use 302 for temporary situations like maintenance or A/B testing.

Q. What does a 403 Forbidden status code mean?

A 403 means the server understood the request but refuses to authorize it. Unlike 401 (Unauthorized), authentication will not help. Common causes include insufficient file permissions, IP restrictions, directory listing being disabled, or WAF rules blocking the request.

Q. When should an API return 404 vs 410?

Return 404 when a resource is not found and may or may not have existed. Return 410 when you know the resource previously existed but has been permanently deleted. 410 signals to search engines to remove the page from their index faster than a 404.

Disclaimer: Results are for informational purposes only and do not constitute professional advice. Always consult qualified professionals for important decisions.

Back to Developer Tools