docs: public static String getBufferTraceInfo(WsByteBuffer buffer) {
          if (null == buffer) {
              return "null";
          }
          StringBuilder sb = new StringBuilder(64);
          sb.append("hc=").append(buffer.hashCode());
          sb.append(" pos=").append(buffer.position());
          sb.append(" lim=").append(buffer.limit());
          sb.append(" cap=").append(buffer.capacity());
          return sb.toString();
      }