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Showing content from https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_ModifyInstanceMetadataDefaults.html below:

ModifyInstanceMetadataDefaults - Amazon Elastic Compute Cloud

Modifies the default instance metadata service (IMDS) settings at the account level in the specified AWS
 Region.

To remove a parameter's account-level default setting, specify no-preference. If an account-level setting is cleared with no-preference, then the instance launch considers the other instance metadata settings. For more information, see Order of precedence for instance metadata options in the Amazon EC2 User Guide.

The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see Common Query Parameters.

DryRun

Checks whether you have the required permissions for the operation, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation. Otherwise, it is UnauthorizedOperation.

Type: Boolean

Required: No

HttpEndpoint

Enables or disables the IMDS endpoint on an instance. When disabled, the instance metadata can't be accessed.

Type: String

Valid Values: disabled | enabled | no-preference

Required: No

HttpPutResponseHopLimit

The maximum number of hops that the metadata token can travel. To indicate no preference, specify -1.

Possible values: Integers from 1 to 64, and -1 to indicate no preference

Type: Integer

Required: No

HttpTokens

Indicates whether IMDSv2 is required.

• optional – IMDSv2 is optional, which means that you can use either IMDSv2 or IMDSv1.

• required – IMDSv2 is required, which means that IMDSv1 is disabled, and you must use IMDSv2.

Type: String

Valid Values: optional | required | no-preference

Required: No

InstanceMetadataTags

Enables or disables access to an instance's tags from the instance metadata. For more information, see Work with instance tags using the instance metadata in the Amazon EC2 User Guide.

Type: String

Valid Values: disabled | enabled | no-preference

Required: No

The following elements are returned by the service.

requestId

The ID of the request.

Type: String

return

If the request succeeds, the response returns true. If the request fails, no response is returned, and instead an error message is returned.

Type: Boolean

For information about the errors that are common to all actions, see Common client error codes.

For more information about using this API in one of the language-specific AWS SDKs, see the following:

ModifyInstanceMaintenanceOptions

ModifyInstanceMetadataOptions

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