code: public byte[] getGZIP(Key key) {
          Value payload = getValue(key, shouldUseReadOnlyResponseCache);
          if (payload == null) {
              return null;
          }
          return payload.getGzipped();
      }
docs: Get the compressed information about the applications.
  
  @param key
  the key for which the compressed cached information needs to
  be obtained.
  @return compressed payload which contains information about the
  applications.