GET /public/images/logo.png 404 12.420毫秒-2529

I am trying to do a GET request using Postman on .public/images/logo.png and I can see the image on the directory on my computer, but what I get is the following error message:

GET /public/images/logo.png 404 12.420 ms - 2529

This is my imagesRouter.js file:

imagesRouter.route('/')
//.options(cors.corsWithOptions, (req, res) => { res.sendStatus(200); })
.get(cors.cors, (req,res,next) => {
    Images.find({})
    .then((images) => {
        res.statusCode = 200;
        res.setHeader('Content-Type', 'application/json');
        res.json(images);
    }, (err) => next(err))
    .catch((err) => next(err));
})

And the following is my models/images.js file:

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var ImagesSchema = new Schema({
    logo: {
      type: String,
        default: '/public/images/logo.png'
    },
    header: {
      type: String,
        default: '/public/images/header.jpg'
    }
});

var Images = mongoose.model('Image', ImagesSchema);
module.exports = Images ;

我想做的是在Angular客户端上提供图像服务，以读取一些主要的网站图像文件（例如徽标，标头等），并厌倦了将图像名称指定为键，将图像地址指定为以下值：

images.ts：

export class Images {
    logo: string;
    header: string;

}

image.service.ts：

@Injectable({
  providedIn: 'root'
})
export class ImagesService {

  constructor(private http: HttpClient,
    private processHTTPMsgService: ProcessHTTPMsgService) { }

  getImages(): Observable<Images> {
    return this.http.get<Images>(baseURL + 'public/images')
      .pipe(catchError(this.processHTTPMsgService.handleError));
  }

}