如何超时angular2 http请求

Question

以下是常规请求:

this.people = http.get('http://localhost:3000/users')
                  .map(response => response.json());

有什么方法可以达到/超时吗？

Answer 1

您可以利用timeout可观察对象的运算符,如下所述:

return this.http.get('http://api.geonames.org/postalCodeSearchJSON',
          { search: params })
    .retryWhen(error => error.delay(500))
    .timeout(2000, new Error('delay exceeded')) // <------
    .map(res => res.json().postalCodes);

有关更多详细信息,请参阅此文章("重试支持"部分):

• http://restlet.com/blog/2016/04/18/interacting-efficiently-with-a-restful-service-with-angular2-and-rxjs-part-3/

Answer 2

返回值http.get()是可观察的,而不是响应.您可以像以下一样使用它:

getPeople() {
  return http.get('http://localhost:3000/users')
      .timeout(2000)
      .map(response => response.json());
  }
}

foo() {
  this.subscription = getPeople.subscribe(data => this.people = data)
}

// to cancel manually
cancel() {
  this.subscription.unsubscribe();
}

另请参见https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/timeout.md

Answer 3

如果您使用的是 RxJS 6 及以上版本，当前的语法是这样的：

从'rxjs/operators'导入{超时}；

getPeople(){
  return this.http.get(API_URL)
  .pipe(
      timeout(5000) //5 seconds
  );