typescript - 具有基本安全授权的 Angular 2 调用 API

Question

我正在尝试从 Angular 2 客户端调用使用 ASP Web API 实现的 HTTP 方法。我收到了这个错误:

OPTIONS http://endpoint/api/Get?key=something 401 (Unauthorized)

XMLHttpRequest cannot load http://endpoint/api/Get?key=something. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access. The response had HTTP status code 401.

这是我的实现，当我在 IIS 服务器上禁用基本身份验证时它运行良好:

import { Http, Response, Headers, RequestOptions } from '@angular/http';
import 'rxjs/add/operator/map'
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { Entity } from "app/view-models/entity";

@Injectable()
export class HttpService {
    headers;
    options;
    constructor(private _http: Http) {
        this.headers = new Headers();
        this.headers.append('Authorization', 'Basic ' + btoa('username:password'));
        this.headers.append("Access-Control-Allow-Credentials", "true");
        this.headers.append('Content-Type', 'application/x-www-form-urlencoded');
        this.options = new RequestOptions();
        this.options = new RequestOptions({ headers: new Headers(this.headers) });
    }

    public Get = (): Observable<Entity> => {
        var params = '?key=something';
        return this._http.get(environment.apiBaseUrl + environment.getSettings + params
            , this.options)
            .map(response => <Entity>response.json());
    }   
}

Answer 1

这看起来更像是 CORS 错误，而不是角度/ typescript 错误。您正试图从“localhost”跨越到“endpoint”。您必须配置端点服务以允许来自该域的请求。

https://learn.microsoft.com/en-us/aspnet/web-api/overview/security/enabling-cross-origin-requests-in-web-api