code: @Override
      public String getCharacterEncoding() {
          if (null == this.encoding) {
              EncodingUtils encodingUtils = connection.getEncodingUtils();
              this.encoding = encodingUtils.getEncodingFromLocale(this.locale);
              if (null == this.encoding) {
                  this.encoding = encodingUtils.getDefaultEncoding();
              }
          }
          return this.encoding;
      }
docs: /*
  @see javax.servlet.ServletResponse#getCharacterEncoding()