private List<HttpBinding> computeRequestBindings(OperationIndex opIndex, OperationShape shape) {
        return createStructureBindings(opIndex.expectInputShape(shape.getId()), true);
    }
Returns true if the response has a modeled body.

@param operation Operation to check.
@return Returns true if the operation has document or payload bindings.
smithy-model/src/main/java/software/amazon/smithy/model/knowledge/HttpBindingIndex.java