在 angular2 上设置 http header

Question

在我的应用程序中，我有一个基于 webService 的构建列表，我想用 http 和 Angular2 来获取它们。我为此创建了一项服务，这是我为此编写的代码：

我的 http 服务：

import { Injectable, Inject } from '@angular/core';
import { RequestOptionsArgs, Http, Response, RequestOptions, Request, RequestMethod, Headers } from '@angular/http';
import 'rxjs/add/operator/map';
import { StaticValuesService } from './static-values.service';
import { Building } from '../model/building';

@Injectable()
export class BuildingService {

  constructor(private _http: Http, private _values: StaticValuesService) {}

  getAllBuildings() {

    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });

    return this._http.get(this._values.MainApi + 'api/getbuildings/', options)
      .map((response: Response) => response.json());

  }

}

然后我用这个代码订阅了一个组件：

constructor(private _buildingServices: BuildingService) { }

  ngOnInit() {
    this._buildingServices.getAllBuildings().subscribe(res => {
      console.log(res);
    }, error => {
        console.log(error);
    });
  }

在我运行 angular 服务器看起来像 contnet-type 没有设置在 header 的请求中！结果是控制台出现 404 错误！

在网络中请求内容chrome:

OPTIONS /api/getbuildings/ HTTP/1.1
Host: nommix-api.azurewebsites.net
Connection: keep-alive
Access-Control-Request-Method: GET
Origin: http://localhost:4200
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36
Access-Control-Request-Headers: authorization, content-type
Accept: */*
Referer: http://localhost:4200/dashboard/master
Accept-Encoding: gzip, deflate, sdch, br
Accept-Language: en,en-US;q=0.8,fa;q=0.6
AlexaToolbar-ALX_NS_PH: AlexaToolbar/alx-4.0

回复header:

HTTP/1.1 404 Not Found
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 134
Content-Type: application/json; charset=utf-8
Expires: -1
Server: Microsoft-IIS/8.0
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Access-Control-Allow-Origin: *
Access-Control-Allow-Headers: Content-Type
Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
Set-Cookie: ARRAffinity=12a1bb0d03776b567fa3d04e126a9fa5ad153cba2c87fbc48fc25d775bebd44a;Path=/;Domain=nommix-api.azurewebsites.net
Date: Thu, 02 Feb 2017 11:51:25 GMT

当我用 Postman 测试 API 时它工作正常。

为什么不起作用？我该如何解决？

谢谢。

Answer 1

假设您通过本教程配置代理https://github.com/angular/angular-cli#proxy-to-backend

尝试在您的后端网络服务中启用 CORS

Access-Control-Allow-Methods: GET, POST, OPTIONS

在 ASP.net 应用程序中启用 OPTIONS 方法

在 angular2 上设置 http header

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