What is an HTTP Status Code?
- HTTP status codes are three-digit responses from the server to the browser that indicate the status of the request.
- HTTP status codes are split into 5 different categories. Each category represents a different kind of status.
1XX: Informational
- A 1XX Informational status code is a temporary status code which means that the server has received the request and is continuing the process.
- A 1XX status code is purely temporary and is given while the request processing continues.
Informational Status Codes:
100 → Continue
101 → Switching Protocols
102 → Processing Request
103 → Early Hints
2XX: Successful
- A 2XX Successful status code means that the request was successful and the browser has received the expected information.
- This means that the request was successful and has been received, processed, and responded to.
Successful Status Codes:
200 → OK
201 → Created
202 → Accepted
203 → Non-Authoritative Information
204 → No Content
205 → Reset Content
206 → Partial Content
207 → Multi-Status
208 → Already Reported
226 → IM Used
3XX: Redirection
- A 3XX Redirection status code means that you have been redirected and the completion of the request requires further action, not necessarily from your side.
300 → Multiple Choices
301 → Moved Permanently
302 → Found
303 → See Other
304 → Not Modified
305 → Use Proxy
306 → Switch Proxy
307 → Temporary Redirect
308 → Permanent Redirect
4XX: Client Error
- A 4XX Client Error status code means that the website or the page could not be reached and either the page is unavailable or the request contains bad syntax.
We web developers hate this (most of the time)!
400 → Bad Request
401 → Unauthorized
402 → Payment Required
403 → Forbidden
404 → Not Found
405 → Method Not Allowed
406 → Not Acceptable
407 → Proxy Authentication Required
408 → Request Timeout
409 → Conflict
410 → Gone
411 → Length Required
412 → Precondition Failed
413 → Payload Too Large
414 → URI Too Long
415 → Unsupported Media Type
416 → Range Not Satisfiable
417 → Expectation Failed
418 → I'm a Teapot
421 → Misdirected Request
422 → Unprocessable Entity
423 → Locked
424 → Failed Dependency
425 → Too Early
426 → Upgrade Required
428 → Precondition Required
429 → Too Many Requests
431 → Request Header Fields Too Large
451 → Unavailable For Legal Reasons
5XX: Server Error
- A 5XX Server error status code means that while the request might be valid, the server could not complete the request. These kinds of errors are mostly caused due to problems internally within the server.
500 → Internal Server Error
501 → Not Implemented
502 → Bad Gateway
503 → Service Unavailable
504 → Gateway Timeout
505 → HTTP Version Not Supported
506 → Variant Also Negotiates
507 → Insufficient Storage
508 → Loop Detected
510 → Not Extended
511 → Network Authentication Required
As a web developer, you really don't need to memorize all of these.
In most scenarios, you'll only see a handful of codes such as 200, 301, and 404.
Just bookmark this page and come back whenever you need to, and take a glance.