我可以使用內HttpInterceptor
承諾?例如:使用承諾在角HttpClient的攔截
export class AuthInterceptor implements HttpInterceptor{
this.someService.someFunction()
.then((data)=>{
//do something with data and then
return next.handle(req);
});
}
爲什麼我需要這個?因爲在向服務器發出請求之前,我需要獲取令牌以添加到請求標頭。
我的攔截器:
@Injectable()
export class AuthInterceptor implements HttpInterceptor{
constructor(private authService: AuthService){}
intercept(req: HttpRequest<any>, next: HttpHandler) : Observable<HttpEvent<any>>{
console.log('Intercepted!');
// return next.handle(req);
this.authService.getToken()
.then((token)=>{
console.log(token);
const reqClone = req.clone({
headers: req.headers
.set('Authorization', 'Bearer ' + token)
.append('Content-Type', application/json')
});
console.log(reqClone);
return next.handle(reqClone);
})
.catch((err)=>{
console.log('error in interceptor' + err);
return null;
});
}
}
請求:
this.http.post(this.baseURL + 'hero', data)
.subscribe(
(res: any) => {
console.log('Saved Successfully.');
console.log(res);
},
(err: any) => {
console.log('Save Error.' + err);
}
);
問題,我面對:
- >我得到這個錯誤的承諾得到解決之前。
You provided 'undefined' where a stream was expected. You can provide an Observable, Promise, Array, or Iterable.
承諾resloves,我讓我的標誌,但在錯誤發生後。
我只是檢查在開發工具我XHR請求,沒有「英雄」的要求there.So,攔截不繼續請求? – nightElf91