What every status code means, when you’ll see it and how to fix it.
Processed on your device, never uploaded
Find a code
100 Continue
1xx Information
What it meansGo ahead and send the rest of the request.Continue
When you see it
A client sends "Expect: 100-continue" before a large upload.
100 Continue: Go ahead and send the rest of the request.Processed on your device, never uploaded
What it does
The HTTP status codes reference explains what each code means without jargon and when you are likely to run into it: 200 and 301, 404 and 429, 502 and 504 and more, including the Cloudflare 5xx codes. Search by number or by a word like redirect or timeout, filter by group, and copy the explanation.
How to use it
1Type a code or a word, or pick a group.
2Choose a code to read what it means and when you see it.
3Copy the explanation.
Questions
What is the difference between 401 and 403?
401 means you need to sign in. 403 means the server knows who you are and still says no.
What is the difference between 502 and 504?
502 means a server in the middle got a broken answer. 504 means it waited too long for one.
Which redirect should I use?
301 or 308 for a permanent move, 302 or 307 for a temporary one.