Angular-为每个请求设置标题 [英] Angular - Set headers for every request
问题描述
对于每个后续请求,我需要在用户登录后设置一些Authorization标头.
I need to set some Authorization headers after the user has logged in, for every subsequent request.
要为特定请求设置标头,
To set headers for a particular request,
import {Headers} from 'angular2/http';
var headers = new Headers();
headers.append(headerName, value);
// HTTP POST using these headers
this.http.post(url, data, {
headers: headers
})
// do something with the response
但是以这种方式为每个请求手动设置请求标头是不可行的.
But it would be not be feasible to manually set request headers for every request in this way.
用户登录后如何设置标头集,并在注销时删除标头?
How do I set the headers set once the user has logged in, and also remove those headers on logout?
推荐答案
要回答,您质疑您是否可以提供包装来自Angular的原始Http
对象的服务.如下所述.
To answer, you question you could provide a service that wraps the original Http
object from Angular. Something like described below.
import {Injectable} from '@angular/core';
import {Http, Headers} from '@angular/http';
@Injectable()
export class HttpClient {
constructor(private http: Http) {}
createAuthorizationHeader(headers: Headers) {
headers.append('Authorization', 'Basic ' +
btoa('username:password'));
}
get(url) {
let headers = new Headers();
this.createAuthorizationHeader(headers);
return this.http.get(url, {
headers: headers
});
}
post(url, data) {
let headers = new Headers();
this.createAuthorizationHeader(headers);
return this.http.post(url, data, {
headers: headers
});
}
}
您可以注入这个对象(HttpClient
),而不是注入Http
对象.
And instead of injecting the Http
object you could inject this one (HttpClient
).
import { HttpClient } from './http-client';
export class MyComponent {
// Notice we inject "our" HttpClient here, naming it Http so it's easier
constructor(http: HttpClient) {
this.http = httpClient;
}
handleSomething() {
this.http.post(url, data).subscribe(result => {
// console.log( result );
});
}
}
我还认为,通过提供自己的扩展Http
的类,可以为Http
类使用多个提供程序来完成某些工作...请参阅此链接:
I also think that something could be done using multi providers for the Http
class by providing your own class extending the Http
one... See this link: http://blog.thoughtram.io/angular2/2015/11/23/multi-providers-in-angular-2.html.
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