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You are browsing the documentation for a deprecated version ('2014-08-15') of the Amazon Mechanical Turk Requester API. **This version of the API will be deprecated and will be rendered unusable as of June 1st, 2019.**
If you request against a legacy API version (https://docs.aws.amazon.com/AWSMechTurk/latest/AWSMturkAPI-legacy/Welcome.html) on or after June 1, 2019, you will receive the following response:
`This Requester API is no longer supported. Please use the latest API using the official AWS SDK. https://aws.amazon.com/getting-started/tools-sdks`
The latest version of our API ('2017-01-17') provides you with additional tool choices and enables you to select from nine [AWS Software Development Kits](https://aws.amazon.com/tools/) (SDKs) that have been widely adopted across the AWS community. This API can be accessed using the following AWS SDKs: [Python/Boto](https://aws.amazon.com/sdk-for-python/) (Boto3), Javascript ([NodeJS](https://aws.amazon.com/sdk-for-node-js/) or [Browser](https://aws.amazon.com/sdk-for-browser/)), [Java](https://aws.amazon.com/sdk-for-java/), [.NET](https://aws.amazon.com/sdk-for-net/), [Go](https://aws.amazon.com/sdk-for-go/), [Ruby](https://aws.amazon.com/sdk-for-ruby/), [PHP](https://aws.amazon.com/sdk-for-php/) or [C\+\+](https://aws.amazon.com/sdk-for-cpp/). This version also makes it easier for customers to connect MTurk with other AWS services like [S3](https://aws.amazon.com/s3/), [Lambda](https://aws.amazon.com/lambda/), [Step Functions](https://aws.amazon.com/step-functions/), [Lex](https://aws.amazon.com/lex/), [Polly](https://aws.amazon.com/polly/), [Rekognition](https://aws.amazon.com/rekognition/), [Amazon SageMaker](https://aws.amazon.com/sagemaker/), [AWS Batch](https://aws.amazon.com/batch/), [EC2](https://aws.amazon.com/ec2/), and more.
This version also updates naming conventions used in the API and adopts the AWS standard of [Signature Version 4](http://docs.aws.amazon.com/general/latest/gr/signature-version-4.html) to authenticate requests securely. The API uses REST requests and no longer requires that developers be familiar with SOAP protocol. These changes make the MTurk API consistent with AWS APIs, simplifying the on-boarding process for both new and existing AWS developers. The legacy MTurk Command Line Tools and .NET, Java, Ruby, and Perl SDKs were marked as deprecated in January 2018. We will be deprecating the legacy APIs as of June 1, 2019.
If you are on a legacy API, you must migrate to the [latest version](http://docs.aws.amazon.com/AWSMechTurk/latest/AWSMturkAPI/Welcome.html) of our API. You can find documentation for the latest API [here](http://docs.aws.amazon.com/AWSMechTurk/latest/AWSMturkAPI/Welcome.html) and the AWS SDKs [here](https://aws.amazon.com/getting-started/tools-sdks/). Please check whether you need to migrate and review the [technical migration guide](https://medium.com/@mechanicalturk/mturk-requester-api-migration-guide-3497398ba37f).
For support, contact [requestor-apilegacydeprecation-support@amazon.com](mailto:requestor-apilegacydeprecation-support@amazon.com). |
# RejectAssignment
## Description
The `RejectAssignment` operation rejects the results of a completed assignment.
You can include an optional feedback message with the rejection, which the Worker can see in the **Status** section of the web site. When you include a feedback message with the rejection, it helps the Worker understand why the assignment was rejected, and can improve the quality of the results the Worker submits in the future.
Only the Requester who created the HIT can reject an assignment for the HIT.
## Request Parameters
The `RejectAssignment` operation accepts parameters common to all operations. Some common parameters are required. See [Common Parameters](ApiReference_CommonParametersArticle.md) for more information.
The following parameters are specific to the `RejectAssignment` operation:
| Name | Description | Required |
| --- | --- | --- |
| `Operation` | The name of the operation
Type: String
Valid Values: RejectAssignment
Default: None | Yes |
| `AssignmentId` | The assignment ID
Type: String
Default: None | Yes |
| `RequesterFeedback` | A message for the Worker, which the Worker can see in the **Status** section of the web site.
Type: String
Default: None
Constraints: can be up to 1024 characters, including multi-byte characters. | No |
## Response Elements
A successful request for the `RejectAssignment` operation returns with no errors. The response includes the elements described in the following table. The operation returns no other data.
| Name | Description |
| --- | --- |
| `RejectAssignmentResult` | Contains a `Request` element if the **Request** `ResponseGroup` is specified. |
## Examples
The following example shows how to use the `RejectAssignment` operation.
### Sample Request
The following example rejects an assignment identified by its assignment ID.
```
https://mechanicalturk.amazonaws.com/?Service=AWSMechanicalTurkRequester
&AWSAccessKeyId={{[the Requester's Access Key ID]}}
&Version=2017-01-17
&Operation=RejectAssignment
&Signature={{[signature for this request]}}
&Timestamp={{[your system's local time]}}
&AssignmentId=123RVWYBAZW00EXAMPLE456RVWYBAZW00EXAMPLE
```
### Sample Response
The following is an example response.
```
True
```