@java.lang.Override
  public java.lang.String getPostProcessingCloudFunction() {
    java.lang.Object ref = postProcessingCloudFunction_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      postProcessingCloudFunction_ = s;
      return s;
    }
  }
<pre>
If not empty, the prediction result will be sent to the specified cloud
function for post processing.
* The cloud function will receive AppPlatformCloudFunctionRequest where
the annotations field will be the json format of proto PredictResponse.
* The cloud function should return AppPlatformCloudFunctionResponse with
PredictResponse stored in the annotations field.
* To drop the prediction output, simply clear the payload field in the
returned AppPlatformCloudFunctionResponse.
</pre>

<code>string post_processing_cloud_function = 3;</code>

@return The postProcessingCloudFunction.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/VertexCustomConfig.java