code: public List<String> getKeys(String key) {
  
  
          final URI uri = createURI("/" + key);
          final HttpRequestBuilder httpRequestBuilder = RequestUtils
                  .getHttpRequestBuilder(null, null, RequestOptions.BLANK, "");
  
  
          httpRequestBuilder.addParam("keys", "true");
  
  
          final HTTP.Response httpResponse = HTTP.getResponse(uri.toString() + "?" + httpRequestBuilder.paramString());
  
  
          if (httpResponse.code() == 200) {
              return fromJsonArray(httpResponse.body(), String.class);
          } else {
              die("Unable to get nested keys", uri, key, httpResponse.code(), httpResponse.body());
              return Collections.emptyList();
          }
      }
docs: Retrieves a list of matching keys for the given key.
  <p>
  GET /v1/keyValueStore/{key}?keys
  
  @param key The key to retrieve.
  @return A list of zero to many keys.