public void setModelSelectionExpression(String modelSelectionExpression) {
        this.modelSelectionExpression = modelSelectionExpression;
    }
<p>
The model selection expression for the route response. Supported only for WebSocket APIs.
</p>

@param modelSelectionExpression
       The model selection expression for the route response. Supported only for WebSocket APIs.
aws-java-sdk-apigatewayv2/src/main/java/com/amazonaws/services/apigatewayv2/model/UpdateRouteResponseRequest.java