HTTP status codes — every code explained
A searchable reference of HTTP status codes with what each one means and when it is used. It runs entirely in your browser (0 uploads, works offline).
How to use it
- Search the table, or browse the whole list.
- Rows filter live as you type.
- Copy or Download the table (or the filtered rows).
FAQ
What does HTTP status code 404 (or any code) mean?
404 means Not Found — the server has no resource at that URL. Search any code on this page and its name and a plain-English note appear instantly, offline, covering the 1xx to 5xx ranges from the HTTP RFCs.
What's the difference between 401 and 403?
401 Unauthorized means you are not authenticated (or your credentials failed); 403 Forbidden means you are authenticated but not allowed to access the resource. Both are on the page with notes.
Is anything uploaded?
No — the whole table is bundled and searched on your device; it works with your Wi-Fi off.
What about 429?
429 Too Many Requests means you have been rate limited; check the Retry-After header for when to try again.
Limits
Covers the standard registered codes. Vendor-specific extensions beyond the RFCs are not listed.
Related
The MIME types and common ports references sit alongside this; the URL parser decomposes URLs.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.