code: public void setFilters(Filter[] filters) {
          if (filters != null && filters.length > 0
                  && this.filters != null && this.filters.length > 0) {
              Filter[] oldFilters = this.filters;
              this.filters = new Filter[oldFilters.length + filters.length];
              System.arraycopy(oldFilters, 0, this.filters, 0, oldFilters.length);
              System.arraycopy(filters, 0, this.filters, oldFilters.length, filters.length);
          } else {
              this.filters = filters;
          }
      }
docs: httl.properties: filters=httl.spi.filters.CompressBlankFilter