public MockLowLevelHttpResponse addHeader(String name,String value){
  headerNames.add(Preconditions.checkNotNull(name));
  headerValues.add(Preconditions.checkNotNull(value));
  return this;
}

public MockLowLevelHttpResponse addHeader ( String name , String value ) { headerNames . add ( Preconditions . checkNotNull ( name ) ) ; headerValues . add ( Preconditions . checkNotNull ( value ) ) ; return this ; }
adds a header to the response .
