HTTP Status codes are issued by a server in response to to the client's request. These status codes (as part of the response message) helps to inform clients around the result of their REST API request.RFC 2616 defines the Status-Line syntax as shown below:
All HTTP response status codes are separated into five classes (or categories). The first digit of the status code defines the class of response.
| Category | Type | Description |
| 1XX | Informational | The request was received, continuing process |
| 2XX | Success | The request was successfully received, understood, and accepted |
| 3XX | Redirection | Further action needs to be taken in order to complete the request |
| 4XX | Client Error | The request contains bad syntax or cannot be fulfilled |
| 5XX | Server Error | The server failed to fulfill an apparently valid request |
Following are some commonly used status codes.
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