public Optional<String> getResponseParameter(String name) {
        return Optional.ofNullable(responseParameters.get(name));
    }
Gets a specific response parameter by it's input mapping expression.

@param name Header name to retrieve.
@return Returns the optionally found response parameter.
smithy-aws-apigateway-traits/src/main/java/software/amazon/smithy/aws/apigateway/traits/IntegrationResponse.java