HTTP status codes are standard response codes given by web site servers on the internet. They are standardized by the Internet Engineering Task Force (IETF) as a part of the HTTP protocol specification, RFC 7231.
The HTTP status codes are grouped into five categories:
Informational responses (100–199)
Successful responses (200–299)
Redirects (300–399)
Client errors (400–499)
Server errors (500–599)
Here is a brief explanation of each category:
Informational responses (100–199): These are provisional responses indicating that the client's request has been received and understood, but that the server has not yet completed its actions.
Successful responses (200–299): These indicate that the server has successfully received, understood, and accepted the client's request.
Redirects (300–399): These indicate that the client must take additional action to complete the request.
Client errors (400–499): These indicate that there was an error in the client's request.
Server errors (500–599): These indicate that the server was unable to complete the request.
Some commonly used HTTP status codes in APIs include:
Successful 2xx
200 OK
201 Created
202 Accepted
203 Non-Authoritative Information
204 No Content
205 Reset Content
Redirection 3xx
300 Multiple Choices
301 Moved Permanently
302 Found
303 See Other
305 Use Proxy
306 (Unused)
307 Temporary Redirect
Client Error 4xx
400 Bad Request
402 Payment Required
403 Forbidden
404 Not Found
405 Method Not Allowed
406 Not Acceptable
408 Request Timeout
409 Conflict
410 Gone
411 Length Required
413 Payload Too Large
414 URI Too Long
415 Unsupported Media Type
417 Expectation Failed
426 Upgrade Required
Server Error 5xx
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout
505 HTTP Version Not Supported
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