HTTP Status Code Lookup
Search HTTP status codes and understand response classes while debugging APIs.
HTTP Status Code Lookup
Search common HTTP response codes by number, phrase, or class. Use it while debugging API responses, redirects, cache behavior, and server errors.
Status code classes
- 1xx informational responses
- 2xx success responses
- 3xx redirects and caching responses
- 4xx client errors and 5xx server errors
How to use HTTP Status Code Lookup
The HTTP status code lookup helps you search common response codes by number, phrase, or class while debugging APIs and web requests.
Developers often use this page when they need http status codes, http status code lookup, status code 404, and status code 500.
Privacy and data handling
This tool is designed to run in your browser for normal use, so your input does not need to be sent to a server.
- Input and output stay on the page while you work.
- Copy buttons use your browser clipboard permission when available.
- Avoid pasting private production data on shared or untrusted devices.
Examples
Look up a common API error
Input
429Output
Too Many Requests
Client Error
The client has sent too many requests in a given time.429 responses often need retry, backoff, or rate limit handling.
Steps
- 1Search by status code, phrase, or error type.
- 2Read the response class and meaning.
- 3Use the result to decide whether the issue is client-side, server-side, or redirect-related.
Common use cases
- Look up 404, 401, 403, 429, 500, and 503 errors.
- Explain API responses during debugging.
- Check redirect status code differences.
Practical tips
- 4xx codes usually point to request or permission problems.
- 5xx codes usually point to server or upstream problems.
- Use 307 or 308 when preserving the original HTTP method matters.
FAQ
Is 404 a server error?
No. 404 is a client error class response, meaning the requested resource was not found.
What is the difference between 301 and 302?
301 is a permanent redirect. 302 is temporary and tells clients the resource may move back later.