我需要在用户登录后为每个后续请求设置一些授权头。
为特定请求设置头信息,
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
参考
但是,以这种方式为每个请求手动设置请求头是不可行的。
我如何设置头设置一旦用户登录,也删除注销这些头?
像下面这样保持独立的服务怎么样
import {Injectable} from '@angular/core';
import {Headers, Http, RequestOptions} from '@angular/http';
@Injectable()
export class HttpClientService extends RequestOptions {
constructor(private requestOptionArgs:RequestOptions) {
super();
}
addHeader(headerName: string, headerValue: string ){
(this.requestOptionArgs.headers as Headers).set(headerName, headerValue);
}
}
当你从另一个地方调用这个时,使用this. httpclientservice。addHeader("Authorization", " holder " + this.tok);
您将看到添加的标题,例如:-授权如下
以下是已接受答案的改进版本,针对Angular2 final进行了更新:
import {Injectable} from "@angular/core";
import {Http, Headers, Response, Request, BaseRequestOptions, RequestMethod} from "@angular/http";
import {I18nService} from "../lang-picker/i18n.service";
import {Observable} from "rxjs";
@Injectable()
export class HttpClient {
constructor(private http: Http, private i18n: I18nService ) {}
get(url:string):Observable<Response> {
return this.request(url, RequestMethod.Get);
}
post(url:string, body:any) {
return this.request(url, RequestMethod.Post, body);
}
private request(url:string, method:RequestMethod, body?:any):Observable<Response>{
let headers = new Headers();
this.createAcceptLanguageHeader(headers);
let options = new BaseRequestOptions();
options.headers = headers;
options.url = url;
options.method = method;
options.body = body;
options.withCredentials = true;
let request = new Request(options);
return this.http.request(request);
}
// set the accept-language header using the value from i18n service that holds the language currently selected by the user
private createAcceptLanguageHeader(headers:Headers) {
headers.append('Accept-Language', this.i18n.getCurrentLang());
}
}
当然,如果需要的话,它应该扩展为delete和put等方法(在我的项目中,目前还不需要它们)。
优点是在get/post/…中有较少的重复代码。方法。
注意,在我的例子中,我使用cookie进行身份验证。我需要i18n的报头(Accept-Language报头),因为我们的API返回的许多值都是用用户的语言翻译的。在我的应用程序中,i18n服务保存用户当前选择的语言。
虽然我很晚才回,但也许能帮到别人。当使用@NgModule时,要向所有请求注入头文件,可以这样做:
(我在Angular 2.0.1中进行了测试)
/**
* Extending BaseRequestOptions to inject common headers to all requests.
*/
class CustomRequestOptions extends BaseRequestOptions {
constructor() {
super();
this.headers.append('Authorization', 'my-token');
this.headers.append('foo', 'bar');
}
}
现在在@NgModule中执行以下操作:
@NgModule({
declarations: [FooComponent],
imports : [
// Angular modules
BrowserModule,
HttpModule, // This is required
/* other modules */
],
providers : [
{provide: LocationStrategy, useClass: HashLocationStrategy},
// This is the main part. We are telling Angular to provide an instance of
// CustomRequestOptions whenever someone injects RequestOptions
{provide: RequestOptions, useClass: CustomRequestOptions}
],
bootstrap : [AppComponent]
})
像下面这样保持独立的服务怎么样
import {Injectable} from '@angular/core';
import {Headers, Http, RequestOptions} from '@angular/http';
@Injectable()
export class HttpClientService extends RequestOptions {
constructor(private requestOptionArgs:RequestOptions) {
super();
}
addHeader(headerName: string, headerValue: string ){
(this.requestOptionArgs.headers as Headers).set(headerName, headerValue);
}
}
当你从另一个地方调用这个时,使用this. httpclientservice。addHeader("Authorization", " holder " + this.tok);
您将看到添加的标题,例如:-授权如下
angular 2.0.1及更高版本有一些改动:
import {RequestOptions, RequestMethod, Headers} from '@angular/http';
import { BrowserModule } from '@angular/platform-browser';
import { HttpModule } from '@angular/http';
import { AppRoutingModule } from './app.routing.module';
import { AppComponent } from './app.component';
//you can move this class to a better place
class GlobalHttpOptions extends RequestOptions {
constructor() {
super({
method: RequestMethod.Get,
headers: new Headers({
'MyHeader': 'MyHeaderValue',
})
});
}
}
@NgModule({
imports: [ BrowserModule, HttpModule, AppRoutingModule ],
declarations: [ AppComponent],
bootstrap: [ AppComponent ],
providers: [ { provide: RequestOptions, useClass: GlobalHttpOptions} ]
})
export class AppModule { }