HTTP and MIME Lookup
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| Type | Key | Value |
|---|---|---|
| HTTP | 404 | Not Found |
| Type | Key | Value |
|---|---|---|
| HTTP | 404 | Not Found |
The HTTP and MIME Lookup is a searchable reference for HTTP status codes and common MIME types. Type 404, 429 or 503 to see what a response means and when to send it, or search a file extension to find the right Content-Type header for an API response or upload.
401 Unauthorized means the request has no valid credentials, so the client should log in. 403 Forbidden means the user is known but not allowed to access the resource.
Use application/json for JSON responses and request bodies.
Last updated: October 2026 · Built by Derar Sattouf