public String getRouteSelectionExpression() {
        return this.routeSelectionExpression;
    }
<p>
The route selection expression for the API. For HTTP APIs, the routeSelectionExpression must be ${request.method}
${request.path}. If not provided, this will be the default for HTTP APIs. This property is required for WebSocket
APIs.
</p>

@return The route selection expression for the API. For HTTP APIs, the routeSelectionExpression must be
        ${request.method} ${request.path}. If not provided, this will be the default for HTTP APIs. This property
        is required for WebSocket APIs.
aws-java-sdk-apigatewayv2/src/main/java/com/amazonaws/services/apigatewayv2/model/CreateApiRequest.java