# SetDefaultPolicyVersion
<a name="API_SetDefaultPolicyVersion"></a>

Sets the specified version of the specified policy as the policy's default (operative) version. This action affects all certificates to which the policy is attached. To list the principals the policy is attached to, use the [ListPrincipalPolicies](API_ListPrincipalPolicies.md) action.

Requires permission to access the [SetDefaultPolicyVersion](https://docs.aws.amazon.com/service-authorization/latest/reference/list_awsiot.html#awsiot-actions-as-permissions) action.

## Request Syntax
<a name="API_SetDefaultPolicyVersion_RequestSyntax"></a>

```
PATCH /policies/policyName/version/policyVersionId HTTP/1.1
```

## URI Request Parameters
<a name="API_SetDefaultPolicyVersion_RequestParameters"></a>

The request uses the following URI parameters.

 ** [policyName](#API_SetDefaultPolicyVersion_RequestSyntax) **   <a name="iot-SetDefaultPolicyVersion-request-uri-policyName"></a>
The policy name.  
Length Constraints: Minimum length of 1. Maximum length of 128.  
Pattern: `[\w+=,.@-]+`   
Required: Yes

 ** [policyVersionId](#API_SetDefaultPolicyVersion_RequestSyntax) **   <a name="iot-SetDefaultPolicyVersion-request-uri-policyVersionId"></a>
The policy version ID.  
Pattern: `[0-9]+`   
Required: Yes

## Request Body
<a name="API_SetDefaultPolicyVersion_RequestBody"></a>

The request does not have a request body.

## Response Syntax
<a name="API_SetDefaultPolicyVersion_ResponseSyntax"></a>

```
HTTP/1.1 200
```

## Response Elements
<a name="API_SetDefaultPolicyVersion_ResponseElements"></a>

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

## Errors
<a name="API_SetDefaultPolicyVersion_Errors"></a>

 ** InternalFailureException **   
An unexpected error has occurred.    
 ** message **   
The message for the exception.
HTTP Status Code: 500

 ** InvalidRequestException **   
The request is not valid.    
 ** message **   
The message for the exception.
HTTP Status Code: 400

 ** ResourceNotFoundException **   
The specified resource does not exist.    
 ** message **   
The message for the exception.
HTTP Status Code: 404

 ** ServiceUnavailableException **   
The service is temporarily unavailable.    
 ** message **   
The message for the exception.
HTTP Status Code: 503

 ** ThrottlingException **   
The rate exceeds the limit.    
 ** message **   
The message for the exception.
HTTP Status Code: 400

 ** UnauthorizedException **   
You are not authorized to perform this operation.    
 ** message **   
The message for the exception.
HTTP Status Code: 401

## See Also
<a name="API_SetDefaultPolicyVersion_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/iot-2015-05-28/SetDefaultPolicyVersion) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/iot-2015-05-28/SetDefaultPolicyVersion) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/iot-2015-05-28/SetDefaultPolicyVersion) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/iot-2015-05-28/SetDefaultPolicyVersion) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/iot-2015-05-28/SetDefaultPolicyVersion) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/iot-2015-05-28/SetDefaultPolicyVersion) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/iot-2015-05-28/SetDefaultPolicyVersion) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/iot-2015-05-28/SetDefaultPolicyVersion) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/iot-2015-05-28/SetDefaultPolicyVersion) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/iot-2015-05-28/SetDefaultPolicyVersion)