📖 What is HTTP Status Codes?
HTTP Status Code Reference explains every HTTP response code — from 100 Continue to 599. Each code includes its official meaning, when servers return it, and how to handle it as a developer. Use it as a quick lookup when debugging API responses, configuring error pages, or learning HTTP. Everything runs in your browser.
💡 Example
Output
404 Not Found — The server cannot find the requested resource. The URL may be wrong, the resource may have been deleted, or the route is not configured.
🛠️ Common Use Cases
- Looking up unfamiliar HTTP status codes during API debugging
- Understanding the difference between similar codes (401 vs 403, 302 vs 307)
- Configuring custom error pages for common status codes
- Learning HTTP protocol fundamentals
- Documenting API response codes
📝 Status Code Categories
- 1xx Informational — request received, processing continues
- 2xx Success — request successfully received and processed
- 3xx Redirection — further action needed to complete the request
- 4xx Client Error — the request contains an error
- 5xx Server Error — the server failed to fulfill a valid request
⚠️ Commonly Confused Codes
- 401 vs 403 — 401 means "not authenticated" (log in first). 403 means "not authorized" (logged in but not allowed).
- 302 vs 307 — both are temporary redirects. 302 may change the method to GET; 307 preserves the original method.
- 404 vs 410 — 404 means "not found" (might return later). 410 means "gone permanently" (better for SEO cleanup).
❓ Frequently Asked Questions
What is the most common HTTP status code? ▾
200 OK is the most common — it means the request succeeded. 404 Not Found is the most common error code.
What is the difference between 401 and 403? ▾
401 Unauthorized means authentication is required — the user is not logged in. 403 Forbidden means the user is authenticated but does not have permission.
When should I use 204 No Content? ▾
Use 204 for successful requests that return no body — typically DELETE operations or updates where no response data is needed.
Is my data private? ▾
Yes — all processing runs entirely in your browser. Your data is never sent to any server.
Is this tool free? ▾
Completely free — no login, no usage limits, works offline once loaded.
Yes — completely free, no login required, no usage limits.
Is my data private? ▾
Yes — all processing runs in your browser. Your data is never sent to any server.
Does it work offline? ▾
Yes — once the page is loaded, the tool works without an internet connection.