HTTP status codes
What the number a website or API sends back means, and when to use each one.
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1xx: hold on
- Go ahead and send the rest of the request
- Switching to another protocol, e.g. WebSocket
- Start loading these files while the page is prepared
2xx: success
- It worked; here is the result
- Something new was made (after POST)
- Received; it will be done later
- It worked; nothing to send back (e.g. after DELETE)
- Part of a file, for resumable downloads and video
3xx: look elsewhere
- The page has a new address for good; search engines follow
- Temporary redirect
- Go to another page, e.g. after submitting a form
- Your saved copy is still current
- Temporary, and keep the same method (POST stays POST)
- Permanent, and keep the same method
4xx: problem with the request
- The request is malformed or missing something
- Not logged in, or the login has expired
- Logged in, but not allowed to do this
- Nothing at this address
- E.g. POST where only GET works
- The request took too long to arrive
- Clashes with the current state, e.g. a duplicate
- It existed but was removed for good
- The upload is too big
- Wrong format, e.g. not JSON
- An old April Fools’ joke; not used for real
- Readable, but the values don’t pass checks
- Slow down: rate limit reached
5xx: problem on the server
- Something broke on the server
- The server can’t do this at all
- A server in between got a bad answer from the next one
- Down for maintenance or overloaded; try again later
- A server in between waited too long for the next one