public Optional<String> getPassThroughBehavior() {
        return Optional.ofNullable(passThroughBehavior);
    }
Gets the pass through behavior of the integration.

<p>Specifies how a request payload of unmapped content type is
passed through the integration request without modification.
Supported values are when_no_templates, when_no_match, and never.

@return Returns the pass through setting.
@see <a href="https://docs.aws.amazon.com/apigateway/api-reference/resource/integration/#passthroughBehavior">Pass through behavior</a>
smithy-aws-apigateway-traits/src/main/java/software/amazon/smithy/aws/apigateway/traits/IntegrationTrait.java