code: @Override
      public String getTrailer(String name) {
          HttpTrailers trailers = message.getTrailers();
          if (trailers != null)
              return trailers.getHeader(name).asString();
          else
              return null;
      }
docs: /*
  (non-Javadoc)
  
  @see com.ibm.wsspi.http.HttpRequest#getTrailer(java.lang.String)