code: private Http2Settings decodeSettingsHeader(ChannelHandlerContext ctx, CharSequence settingsHeader)
              throws Http2Exception {
          ByteBuf header = ByteBufUtil.encodeString(ctx.alloc(), CharBuffer.wrap(settingsHeader), CharsetUtil.UTF_8);
          try {
              // Decode the SETTINGS payload.
              ByteBuf payload = Base64.decode(header, URL_SAFE);
  
              // Create an HTTP/2 frame for the settings.
              ByteBuf frame = createSettingsFrame(ctx, payload);
  
              // Decode the SETTINGS frame and return the settings object.
              return decodeSettings(ctx, frame);
          } finally {
              header.release();
          }
      }
docs: Decodes the settings header and returns a {@link Http2Settings} object.