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HTTP Status Code Reference

Look up any HTTP status code instantly.

HTTP Status Code Reference

HTTP status codes are three-digit numeric codes that web servers send in response to a client's request. They tell you whether the request succeeded, failed, or requires further action. As a developer, knowing these codes is essential for debugging APIs, understanding network behavior, and building robust web applications.

How to Use the Status Code Reference

1
Search: Type a status code number (like "404"), a name (like "Not Found"), or a keyword (like "redirect") in the search box.
2
Filter by Category: Use the dropdown to filter by category — 1xx Informational, 2xx Success, 3xx Redirection, 4xx Client Error, or 5xx Server Error.
3
View Details: Click any status code in the list to see its full description, use case, and common causes.

HTTP Status Code Categories

HTTP status codes are grouped into five classes. 1xx (Informational) codes indicate the server has received the request and is processing it. 2xx (Success) codes confirm the request was received, understood, and accepted (e.g., 200 OK, 201 Created). 3xx (Redirection) codes tell the client to take additional action (e.g., 301 Moved Permanently, 302 Found). 4xx (Client Error) codes indicate the client made a bad request (e.g., 404 Not Found, 401 Unauthorized, 403 Forbidden). 5xx (Server Error) codes mean the server failed to process a valid request (e.g., 500 Internal Server Error, 503 Service Unavailable).

Frequently Asked Questions

What is the difference between 401 and 403?

401 Unauthorized means the client is not authenticated. 403 Forbidden means the client IS authenticated but lacks permission.

What is the difference between 301 and 302?

301 Moved Permanently is a permanent SEO redirect. 302 Found is a temporary redirect — search engines keep the original URL.

What causes a 502 Bad Gateway?

A 502 occurs when the proxy received an invalid response from the upstream backend. Common causes: backend app crash or deployment in progress.

What is a 422 vs 400?

400 Bad Request means the syntax is malformed. 422 Unprocessable Entity means syntax is valid but business logic validation failed.

How many HTTP status codes are there?

The HTTP specification defines over 60 status codes. This reference covers the most commonly encountered ones in web and API development.