# x-amazon-apigateway-gateway-responses.responseParameters object
<a name="api-gateway-swagger-extensions-gateway-responses.responseParameters"></a>

Defines a string-to-string map of key-value pairs to generate gateway response parameters from the incoming request parameters or using literal strings. Supported only for REST APIs.


| Property name | Type | Description | 
| --- | --- | --- | 
| gatewayresponse.param-position.param-name | string |  `param-position` can be `header`, `path`, or `querystring`. For more information, see [Parameter mapping for REST APIs in API Gateway](rest-api-parameter-mapping.md).  | 

## x-amazon-apigateway-gateway-responses.responseParameters example
<a name="api-gateway-swagger-extensions-gateway-responses.responseParameters-example"></a>

 The following OpenAPI extensions example shows a [GatewayResponse](https://docs.aws.amazon.com/apigateway/latest/api/API_GatewayResponse.html) response parameter mapping expression to enable CORS support for resources on the `*.example.domain` domains. 

```
      "responseParameters": {
        "gatewayresponse.header.Access-Control-Allow-Origin": '*.example.domain',
        "gatewayresponse.header.from-request-header" : method.request.header.Accept,
        "gatewayresponse.header.from-request-path" : method.request.path.petId,
        "gatewayresponse.header.from-request-query" : method.request.querystring.qname
      }
```