public void setImageUrl(String imageUrl) {
        this.imageUrl = imageUrl;
    }
<p>
The URL of an image to display on the response card. The image URL must be publicly available so that the
platform displaying the response card has access to the image.
</p>

@param imageUrl
       The URL of an image to display on the response card. The image URL must be publicly available so that the
       platform displaying the response card has access to the image.
aws-java-sdk-lexruntimev2/src/main/java/com/amazonaws/services/lexruntimev2/model/ImageResponseCard.java