code: package helpers;
  
  import static spark.Spark.*;
  
  public class FeaturizerServer {
      public static void main(String[] args) {
  
          CoreNLPFeaturizer f = new CoreNLPFeaturizer();
  
          post("/", "application/json", (req,res) -> {
              String sentence = req.queryParams("sentence");
              String is_raw = req.queryParams("is_raw");
  
              if (is_raw.toLowerCase().equals("true"))
                  return  f.featurizer.extractFeatures(sentence, "raw");
              else
                  return  f.featurizer.extractFeatures(sentence, "conll");
          });
      }
  }