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

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