public Builder contentHandling(String contentHandling) {
            this.contentHandling = contentHandling;
            return this;
        }
Set the Request payload encoding conversion types.

<p>Valid values are:

<ul>
    <li>CONVERT_TO_TEXT, for converting a binary payload into a
    Base64-encoded string or converting a text payload into a
    utf-8-encoded string or passing through the text payload natively
    without modification</li>
    <li>CONVERT_TO_BINARY, for converting a text payload into
    Base64-decoded blob or passing through a binary payload natively
    without modification.</li>
</ul>

@param contentHandling Content handling property.
@return Returns the builder.
smithy-aws-apigateway-traits/src/main/java/software/amazon/smithy/aws/apigateway/traits/MockIntegrationTrait.java