docs: public boolean isReadOnlyRequest( final String requestId ) {
          if ( _log.isDebugEnabled() ) {
              _log.debug( "Asked for readonly request: " + requestId + " ("+ _readOnlyRequests.containsKey( requestId ) +")" );
          }
          // TODO: add some threshold
          return _readOnlyRequests.containsKey( requestId );
      }