static AggregatedHttpMessage of(HttpHeaders headers,HttpData content,HttpHeaders trailingHeaders){
  return of(Collections.emptyList(),headers,content,trailingHeaders);
}

static AggregatedHttpMessage of ( HttpHeaders headers , HttpData content , HttpHeaders trailingHeaders ) { return of ( Collections . emptyList ( ) , headers , content , trailingHeaders ) ; }
creates a new http message .
