HTTP Status Codes

100 - 199

• Used for "Information". You rarely use them directly.
• Responses with these status codes cannot have a body

200 - 299

• Used for "Successful" responses.
• 200 is the default status code, which means everything was "OK".
• 201, "Created". It is commonly used after creating a new record in the database.
• A special case is 204, "No Content". This response is used when there is no content to return to the client, and so the response must not have a body.

300 - 399

• Used for "Redirection".
• Responses with these status codes may or may not have a body, except for 304, "Not Modified", which must not have one

400 - 499

• Used for "Client error" responses.
• 404, for a "Not Found" response.
• For generic errors from the client, you can just use 400.

500 - 599

• Used for server errors.
• When something goes wrong at some part in your application code, or server, it will automatically return one of these status codes