What do the different HTTP status code ranges mean?

1xx (Informational): the request was received and processing continues. 2xx (Success): the request was successfully received, understood, and accepted. 3xx (Redirection): further action is needed to complete the request. 4xx (Client Error): the request contains bad syntax or cannot be fulfilled. 5xx (Server Error): the server failed to fulfill a valid request.

What is the difference between 301 and 302?

301 (Moved Permanently) tells browsers and search engines that the resource has moved to a new URL indefinitely — they should update their records. 302 (Found) is a temporary redirect; clients should continue using the original URL for future requests.

What is the difference between 401 and 403?

401 (Unauthorized) means the client must authenticate — credentials are missing or invalid. 403 (Forbidden) means the server understood the request but refuses to authorize it — even with valid credentials the user is not permitted.

What causes a 500 error?

500 (Internal Server Error) is a generic server-side error, typically caused by an unhandled exception, misconfiguration, or bug in the server application. Check server logs for more specific information.

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HTTP Status Codes

Complete reference of all standard HTTP status codes with descriptions and examples.

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About this tool

A comprehensive, searchable reference for all standard HTTP status codes from 1xx Informational to 5xx Server Error. Search by code number or keyword to find the status you need. Each entry includes the numeric code, official name, a plain-English description, and a practical example use case. Filter by category (1xx, 2xx, 3xx, 4xx, 5xx) using the tab bar. Click any code to copy it to your clipboard. An indispensable quick-reference for web developers, API designers, and anyone debugging HTTP issues.

How to use

1 Use the search box to find a code by number or name — results update instantly.
2 Click a category tab (1xx–5xx) to filter by status class.
3 Read the description and example use case for each code.
4 Click any status code number to copy it to your clipboard.
5 Combine search and tab filter to narrow results.

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