static getFilePNG (req, res) {
    SessionAPIs.#reqGetRawBody(req, (err, data) => {
      if (err || data === null || data.length === 0) {
        return res.send(internals.emptyPNG);
      }

      res.setHeader('Content-Type', 'image/png');

      const png = new PNG({
        width: internals.PNG_LINE_WIDTH,
        height: Math.ceil(data.length / internals.PNG_LINE_WIDTH)
      });

      png.data = data;

      res.send(PNG.sync.write(png, { inputColorType: 0, colorType: 0, bitDepth: 8, inputHasAlpha: false }));
    });
  }
GET - /api/session/:nodeName/:id/bodypng/:bodyType/:bodyNum/:bodyName

Retrieves a bitmap image representation of the bytes in a file.
@name /session/:nodeName/:id/bodypng/:bodyType/:bodyNum/:bodyName
@returns {image/png} image - The bitmap image.