HTTP Status Codes

Sr. No.	HTTP Code	Description
1	200	OK, shows success.
2	201	CREATED, when a resource is successful created using POST or PUT request. Return link to newly created resource using location header.
3	204	NO CONTENT, when response body is empty for example, a DELETE request.
4	304	NOT MODIFIED, used to reduce network bandwidth usage in case of conditional GET requests. Response body should be empty. Headers should have date, location etc.
5	400	BAD REQUEST, states that invalid input is provided e.g. validation error, missing data.
6	401	UNAUTHORIZED, states that user is using invalid or wrong authentication token.
7	403	FORBIDDEN, states that user is not having access to method being used for example, delete access without admin rights.
8	404	NOT FOUND, states that method is not available.
9	409	CONFLICT, states conflict situation while executing the method for example, adding duplicate entry.
10	500	INTERNAL SERVER ERROR, states that server has thrown some exception while executing the method.