Angular http 客户端 return 204 http 代码时为 false

Question

我用我的 angular 服务发出了一个 http post 请求，我正在等待一个布尔值 return。但是对于没有内容的 204 http 代码响应，angular return false.

这是我的服务功能：

public create(
        base_price: number,
        domain_id: number|null
    ): Observable<boolean> {
        this.isLoadingSubject.next(true);
        return this.http.post<boolean>(`${API_URL}/pictures`, {
            base_price,
            domain_id
        })
        .pipe(finalize(() => this.isLoadingSubject.next(false)))
    }

还有我的组件：

submit() {
        this.hasError = false;
        const create = this.pictureService
            .create(
                this.f.base_price.value,
                this.f.domain_id.value,
            )
            .pipe(first())
            .subscribe((result: boolean) => {
                this.hasError = !result;
            });
        this.unsubscribe.push(create);
    }

所以 create 函数 return false 并且在我的案例中我没有找到捕获 204 状态的解决方案。

谢谢

Answer 1

如果我们要读取错误状态并且如果它是 204 我们 return 错误怎么办？在我的例子中，我得到的是 404，但你可以将它换成 204。

<div class="card text-center m-3">
    <h5 class="card-header">POST request with error handling</h5>
    <div class="card-body">
        Error message: {{errorMessage}}
        <br>
        I will return boolean: {{returnBool}}
    </div>
</div>

@Component({
  selector: 'post-request-error-handling',
  templateUrl: 'post-request-error-handling.component.html',
})
export class PostRequestErrorHandlingComponent implements OnInit {
  postId;
  errorMessage;
  returnBool: boolean;

  constructor(private http: HttpClient) {}

  ngOnInit() {
    this.http
      .post<any>('https://reqres.in/invalid-url', {
        title: 'Angular POST Request Example',
      })
      .subscribe({
        next: (data) => {
          this.postId = data.id;
        },
        error: (error) => {
          this.errorMessage = error.message;
          console.error('There was an error!', error);
          if (error.status == 404) {
            console.log('Return boolean false');
            this.returnBool = false;
          }
        },
      });
  }
}

这是一个工作示例：https://stackblitz.com/edit/angular-http-post-examples-hpa8pv?file=app%2Fcomponents%2Fpost-request-error-handling.component.ts

Answer 2

您只是想检查响应是否为 204？

如果是这种情况，您只需将 observe: response 添加到选项即可。

this.http.post < boolean > (`${API_URL}/pictures`, {
  base_price,
  domain_id
}, {
  observe: 'response'
})

然后你检查响应状态像

submit() {
        this.hasError = false;
        const create = this.pictureService
            .create(
                this.f.base_price.value,
                this.f.domain_id.value,
            )
            .pipe(first())
            .subscribe(response => {
                if (response.status !== 204) {
                   // Do whatever
                }
            });
        this.unsubscribe.push(create);
    }

HttpClient 文档https://angular.io/guide/http#reading-the-full-response

Angular http 客户端 return 204 http 代码时为 false

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