```java
/**
* 嘗試繪圖
*/
@GetMapping("/img/")
public ResponseEntity<byte[]> draw(@PathVariable("width") int width, @PathVariable("height") int height) throws IOException, Exception {
// Convert the BufferedImage to a byte array
ByteArrayOutputStream baos = new ByteArrayOutputStream();
// some code ...
ImageIO.write(image.appendRow(img1, img2, img3), "png", baos);
byte[] bytes = baos.toByteArray();
// Create and return a ResponseEntity with the image byte array and the appropriate headers
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_PNG);
// headers.setContentType(MediaType.IMAGE_JPEG);
headers.setContentLength(bytes.length);
return new ResponseEntity<>(bytes, headers, HttpStatus.OK);
}
```