axios在尝试获取列表时出错

Question

我需要从这个资源http://jsonplaceholder.typicode.com/photos中获得一个列表

控制器

    @JsonController('/photo')
    @Service()
    export class PhotoController {
    constructor(private photoService: PhotoService) {}

    @Get('/load-photos')
    loadPhoto() {
        return axios
            .get('http://jsonplaceholder.typicode.com/photos')
            .then(async (response) => console.log(response.data.slice(0, 8)))
            .catch((e) => console.log(e));
    }
}

邮递员路线：http://localhost:5000/photo/load-photos

当我试图通过axios通过postman请求一个资源时，我就调用控制器，得到下面给出的错误。如果我在应用程序之外执行一个操作，那么通过axios，我可以很容易地将数据输入控制台，例如。

错误

Error:
    at new HttpError (C:\pet-project\express\node_modules\src\http-error\HttpError.ts:16:18)
    at new NotFoundError (C:\pet-project\express\node_modules\src\http-error\NotFoundError.ts:10:5)
    at ExpressDriver.handleSuccess (C:\pet-project\express\node_modules\src\driver\express\ExpressDriver.ts:324:15)
    at C:\pet-project\express\node_modules\src\RoutingControllers.ts:164:35
    at processTicksAndRejections (internal/process/task_queues.js:95:5)

申请课程：

export class App {
    public app: express.Application;

    constructor() {
        this.app = express();
    }

    public async createExpressServer(port: number) {
        useContainer(Container);
        useExpressServer(this.app, {
            controllers: [AuthController, PhotoController],
            middlewares: [],
            authorizationChecker: async (action: Action, roles?: string[]): Promise<boolean> => {
                return false;
            }
        });
        this.app.listen(port, () => console.log(`Running on port ${port}`));
    }
}

呼叫应用程序：

const app = new App();
const port: any = process.env.APP_PORT;
app.createExpressServer(5000);

我在应用程序中使用了什么:快速和路由控制器库

问:当我试图从控制器获取资源数据时，为什么会出现这个错误？谢谢您的回复！

Answer 1

您没有返回一个正确的、非空的结果或包含这样的结果的承诺，这就是为什么您得到了一个404错误，正如正式文件所说的。尝试使用await获得一个结果并显式返回：

    @JsonController('/photo')
    @Service()
    export class PhotoController {
    constructor(private photoService: PhotoService) {}

    @Get('/load-photos')
    async loadPhoto() {
       try {
         const { data } = await axios
            .get('http://jsonplaceholder.typicode.com/photos');
         return data.slice(0, 8)
       } catch (e: Error) {
          console.log(e)
          // returns 404 for instance, it's up to you, 
          // see https://github.com/typestack/routing-controllers#throw-http-errors
          throw new NotFoundError(`Photos were not found.`); 
       }
    }
}