Last updated: 2019-07-08 20:38:13

Returned Result for Success

Take viewing the instance state list (DescribeInstancesStatus) version 2017-03-12 through the Cloud Virtual Machine API as an example. If the call succeeds, the possible returned result is as follows:

    "Response": {
        "TotalCount": 0,
        "InstanceStatusSet": [],
        "RequestId": "b5b41468-520d-4192-b42f-595cc34b6c1c"
  • Response and its internal RequestId are fixed fields and will be returned as long as processed by the API no matter whether the request succeeds.
  • RequestId is used to uniquely identify an API request. If the API is abnormal, you can contact us and provide the ID for troubleshooting.
  • Except for the fixed fields, all the fields are defined by the specific API. For the fields returned by different APIs, see the definitions in the API documentation. In this example, TotalCount and InstanceStatusSet are the fields defined by the DescribeInstancesStatus API. As the user who calls the request does not have a Cloud Virtual Machine instance yet, TotalCount returns a value of 0 in this case and the InstanceStatusSet list is empty.

Returned Result for Error

If the call fails, the returned result may look like the example below:

    "Response": {
        "Error": {
            "Code": "AuthFailure.SignatureFailure",
            "Message": "The provided credentials could not be validated. Please check your signature is correct."
        "RequestId": "ed93f3cb-f35e-473f-b9f3-0d451b8b79c6"
  • The presence of the Error field indicates that the request call failed. The Error field and its internal Code and Message fields, must be returned when the call fails.
  • Code indicates the error code of the specific error. When the request goes wrong, you can use this error code to locate the cause and solution in the common error code list and the error code list corresponding to the current API.
  • Message shows the specific cause of this error. The message text is subject to change or update as the business develops or the experience gets optimized, so you should not rely on this return value.
  • RequestId is used to uniquely identify an API request. If the API is abnormal, you can contact us and provide the ID for troubleshooting.

Common Error Codes

If there is an Error field in the returned result, it means that the API call failed. The Code field in Error indicates the error code. The error codes that may appear for all businesses are common error codes, which are listed below:

Error code Error description
InvalidParameter Wrong parameter (including errors with parameter format, type, etc.)
InvalidParameterValue Wrong parameter value
MissingParameter Missing parameter; a required parameter is missing
UnknownParameter Unknown parameter; an undefined parameter passed in by the user will cause this error
AuthFailure Error with CAM signature/authentication
InternalError Internal error
InvalidAction API does not exist
UnauthorizedOperation Unauthorized operation
RequestLimitExceeded The number of requests exceeds the frequency limit
NoSuchVersion API version does not exist
UnsupportedRegion API does not support the passing region
UnsupportedOperation Unsupported operation
ResourceNotFound Resource does not exist
LimitExceeded Quota limit is exceeded
ResourceUnavailable Resource not available
ResourceInsufficient Insufficient resource
FailedOperation Operation failed
ResourceInUse Resource is in use
DryRunOperation DryRun operation, which means the request will succeed, but an unnecessary DryRun parameter is passed in