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Http Status Codes

HTTP status codes are 3-digit numbers that a server sends back to the client (like a browser or API consumer) to indicate the result of the request. They are categorized into 5 main types (classes) based on the first digit.

Code Range	Type	Meaning
1xx	Informational	Request received, continuing process
2xx	Success	Request successfully received & handled
3xx	Redirection	Further action needed to complete the request
4xx	Client Error	The request contains bad syntax or cannot be fulfilled
5xx	Server Error	Server failed to fulfill a valid request

1xx - Informational

These codes indicate that the request was received and is being processed.

Code Range	Type	Meaning
100	Continue	Server received request headers, waiting for body.
101	Switching Protocols	Client asked server to switch protocols (e.g., HTTP → WebSocket).

2xx - Success

The request was successfully received, understood, and accepted.

Code Range	Type	Meaning
200	Ok	The request was successful.
201	Created	Resource was created successfully (e.g., after POST).
202	Accepted	Request accepted but processing not completed yet.
204	No Content	Successful, but no content to return.

3xx - Redirection

Client must take additional steps to complete the request.

Code Range	Type	Meaning
301	Moved Permanently	Resource has permanently moved to a new URL.
302	Found	Temporarily moved to another URL.
304	Not Modified	Cached version is still valid, no new data sent.

4xx - Client Error

The request was invalid or cannot be processed by the server.

Code Range	Type	Meaning
400	Bad Request	Request syntax is invalid.
401	Unauthorized	Requires authentication.
403	Forbidden	Authenticated but not allowed to access.
404	Not Found	The requested resource doesn’t exist.
405	Method Not Allowed	HTTP method not allowed for this route.
429	Too Many Requests	Rate limit exceeded.

5xx - Server Error