The following list of request parameters only lists interface request parameters and some public parameters, For a complete list of public parameters see public request parameters.

Parameter name	Required	Allow NULL	Type	Description
Action	Yes	No	String	Public parameter, The value of this interface: DescribeTargets
Version	Yes	No	String	Public parameter, The value of this interface: 2018-03-17
Region	No	No	String	Public parameter,Regional information A list of supported geographies is available through the DescribeRegions interface
LoadBalancerId	Yes	No	String	CLB instance ID Example: lb-10iq9lou
ListenerIds	No	No	Array of String	List of listener IDs Example: ["lbl-4fo6k8na"]
Protocol	No	No	String	Listener protocol type, supporting TCP, UDP, HTTP, HTTPS, and TCP_SSL. Example: HTTP
Port	No	No	Int64	Listener port Example: 80

3. Output Parameters

Parameter name	Type	Description
Listeners	Array of ListenerBackend	Information of real servers bound to the listener Example:View
RequestId	String	Unique request id, Each request will return. The RequestId of the request needs to be provided when locating the problem.

4. Error Code

The following lists only the error codes related to the interface business logic, For other error codes, see public ErrorCode.

Error Code	Description
InvalidParameter	Wrong parameter.
InvalidParameterValue	Incorrect parameter value
InternalError	Internal Error
UnauthorizedOperation	Unauthorized operation
FailedOperation	Failed to operate.
InvalidParameter.FormatError	Incorrect parameter format
InvalidParameterValue.Length	Invalid parameter length.