What is the difference between 301 and 302 redirects?

301 Moved Permanently tells browsers and search engines that the redirect is permanent—they should update their bookmarks and indexes to the new URL. 302 Found indicates a temporary redirect—the original URL should still be used in the future. For SEO, use 301 for permanent moves and 302 for temporary ones.

What is the difference between 401 and 403?

401 Unauthorized means the request lacks valid authentication credentials—the user needs to log in. 403 Forbidden means the server understands the request but refuses to authorize it, even with valid credentials—the user doesn't have permission for this specific resource.

What does 429 Too Many Requests mean?

429 indicates the client has sent too many requests in a given time period (rate limiting). The response typically includes a Retry-After header telling the client how long to wait before trying again. This is commonly used by APIs to enforce rate limits.

Are unofficial status codes included?

The reference focuses on standard codes defined in RFC specifications. Some widely used unofficial codes (like 429, which was later standardized) are included with a note about their origin. Proprietary codes specific to individual services are not covered.

Does this tool work offline?

Yes. All status code data is embedded in the page and no network requests are made. Once the page is loaded, you can use the search and browse features even without an internet connection.

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HTTP Status Codes Reference

An HTTP status codes reference is a searchable directory of standard HTTP response codes organized by category (1xx–5xx). It provides instant lookup by code number or keyword, with detailed descriptions, RFC source references, and usage guidance for each code.

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What is HTTP Status Codes Reference?

An HTTP status codes reference is an online utility that provides a searchable, categorized directory of standard HTTP response status codes with descriptions, RFC source references, and usage guidance.

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Every web developer encounters unfamiliar status codes sooner or later. The HTTP status codes reference gives you instant answers—search by code or keyword, browse by category, and read the detailed description with RFC source. It works offline, loads instantly, and requires no account. Next time you see a 502 or a 429, you'll know exactly what it means and what to do about it.

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