Use Appropriate Status Codes

Every API MUST use the appropriate HTTP Status Codes to communicate the result of a request operation.

Every API designer, implementer and consumer MUST understand the semantic of the HTTP Status Code she is using.

At a minimum everyone MUST be familiar with the semantics of "Common" HTTP Status Codes.

Example

Use Codes 4xx or 5xx to Communicate Errors

A request:

GET /orders/1234 HTTP/1.1
...

resulting in the 200 OK response, when the requested resource (as identified by request URI) couldn't be found:

HTTP/1.1 200 OK
Content-Type: application/json
...


{
    "code": "NOT_FOUND_ERR_CODE"
    "message" "Order 1234 wasn't found"
}

is not acceptable.

Instead the

HTTP/1.1 404 Not Found
...

should be returned.

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