添加报头，以在角6 http.get

Posted 2021-05-03

我试图修改从deerawan工作实例，包括另一个网站，需要一个头球冲顶。我得到了下面的解决方案，它似乎很好地工作。但是，当我加subscribe()，它仍然有效，但我在控制台中看到异常：

我应该怎么做来解决这个警告信息吗？谢谢。

原代码：

export class UserService {

  private serviceUrl = 'https://jsonplaceholder.typicode.com/users';

  constructor(private http: HttpClient) { }

  getUser(): Observable<User[]> {
    return this.http.get<User[]>(this.serviceUrl);
  }
}

解决方案的代码：

export class NWSForecast {
  private config = {
    headers: {
      'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (Khtml, like Gecko) Chrome/35.0.1916.153 Safari/537.36'
    }
  };

  private serviceUrl = 'https://api.weather.gov/gridpoints/OKX/36,38/forecast';

  constructor(private http: HttpClient) { }

  getUser(): Observable<any>  {
    // first argument is URL, put config as second argument
    return this.http.get<any>(this.serviceUrl, this.config);
  }
}

改性，以便捕捉响应溶液。但它也有例外：

export class AppComponent {
  private config = {
    headers: {
      'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36'
    }
  };
  weathers: any;
  private serviceUrl = 'https://api.weather.gov/gridpoints/OKX/36,38/forecast';

  constructor(private http: HttpClient) { }

  getWeather() {
    this.http.get<Weather>(this.serviceUrl, this.config).subscribe(
      val => {
        this.weathers = val;
      console.log('this.weather ====> ', this.weathers);
      });
    }
}

在控制台中的错误消息：Refused to set unsafe header "User-Agent" http.js:1436

答案

因为你需要提供的网址为get第一个参数你所得到的错误。

 this.http.get<Weather>(url, this.config);

另一答案

角的http.get()需要两个参数，URL和选项。你将它们作为1这将导致这个问题！下面是我经常在角7添加自定义页眉到我的服务：

import { HttpClient, HttpHeaders } from '@angular/common/http';

export class NWSForecast {
  private headerObj = new HttpHeaders({'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36'})

  private serviceUrl = 'https://api.weather.gov/gridpoints/OKX/36,38/forecast'

  constructor(private http: HttpClient) { }

  getUser(): Observable<Weather>  {
    console.log(this.http.get<Weather>(this.config));
    return this.http.get<Weather>(this.serviceUrl, {headers: this.headerObj});
  }
}

你也可以选择传球而不是指定在http.get()头参数整个对象：

const httpOptions = {
  headers: new HttpHeaders({
    'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36'
  })
};

然后，你的回报将是：

return this.http.get<Weather>(this.serviceUrl, httpOptions);

我经常发现角文档有相当不错的例子 - Angular HTTP Guide - Adding Headers

另一答案

基于documentation，HttpClient.get的第一个参数是URL，第二个是配置。

所以，你的代码应该是象下面这样：

export class NWSForecast {
  private config = {
    headers: {
      'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36'
    }
  };

  private serviceUrl = 'https://api.weather.gov/gridpoints/OKX/36,38/forecast';

  constructor(private http: HttpClient) { }

  getUser(): Observable<any>  {
    // first argument is URL, put config as second argument
    return this.http.get<any>(this.serviceUrl, this.config);
  }
}

经测试，它的工作原理