public ImageUrlsRequest build() {
    ImageUrlsRequest request = new ImageUrlsRequest(mEndpointUrl, mRequestedImageFormats);
    mRequestedImageFormats = null;
    return request;
  }
Adds imageFormat to the set of image formats you want to download. imageSize specify
server-side resize options.
samples/comparison/src/main/java/com/facebook/samples/comparison/urlsfetcher/ImageUrlsRequestBuilder.java