Angular - 连接到代理服务器并获得响应,但随后显示在尝试代理时发生错误:localhost到实际服务器

Question

我是Angular(2,4)的新手.我试图连接到代理服务器.

proxy.config.json在项目根目录中添加

{
    "/api/*": {
        "target": "http://<server_ip_address>:<port>",
        "secure": false,
        "changeOrigin": true,
        "logLevel": "debug"
    }
}

然后start在package.json中添加了代理配置

"scripts": {
        "ng": "ng",
        "start": "ng serve --proxy-config proxy.config.json",
        "build": "ng build",
        "test": "ng test",
        "lint": "ng lint",
        "e2e": "ng e2e"
    },

现在在组件中我有一个连接到服务器的登录方法.

import { Component, OnInit } from '@angular/core';
import { Router, ActivatedRoute } from '@angular/router';

import { AlertService, AuthenticationService } from '../services/index';

@Component({
    moduleId: module.id.toString(),
    templateUrl: 'login.component.html'
})

export class LoginComponent implements OnInit {
    model: any = {};
    loading = false;
    returnUrl: string;

    constructor(
        private route: ActivatedRoute,
        private router: Router,
        private authenticationService: AuthenticationService,
        private alertService: AlertService) { }

    login() {
            this.loading = true;
            this.authenticationService.login(this.model.email, this.model.password)
                .subscribe(data => {
                    localStorage.setItem('currentUser', JSON.stringify(data));
                    this.router.navigate([this.returnUrl]);
                },
                error => {
                    this.alertService.error(error);
                    this.loading = false;
                },
                () => {
                    console.log("Subscribed Else");
                });
        }
}

在身份验证服务中,我有以下代码.

import { Injectable } from '@angular/core';
import { Http, Headers, Response } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/throw';


@Injectable()
export class AuthenticationService {
    headers = new Headers();

    constructor(private http: Http) {
        this.headers.append("Content-Type", "application/json");
    }

    login(email: string, password: string) {
        return this.http.post('/api/v1/login', { email: email, password: password }, { headers: this.headers })
            .map(this.extractData)
            .catch(this.handleError);
    }

    private extractData(response: Response) {
        let user = response.json();
        return user;
    }
    private handleError(error: Response | any) {
        // In a real world app, you might use a remote logging infrastructure
        let errMsg: string;
        let resMsg: string;
        if (error instanceof Response) {
            const body = error.json() || '';
            resMsg = body['message'];
            console.log(body);
            console.log(resMsg);
        } else {
            resMsg = error.message ? error.message : error.toString();
        }
        return Observable.throw(resMsg);
    }
}

连接工作正常.服务器使用正确的JSON数据进行响应.但我可以登录.

真正的问题

有点奇怪.有时它工作正常,但大多数它甚至在正确连接到服务器后也显示出问题.服务器使用JSON数据进行响应.然后在终端控制台中显示

[HPM]尝试将请求/ api/v1 /登录从localhost:4200代理到http://:(ECONNRESET)(https://nodejs.org/api/errors.html#errors_common_system_errors)时发生错误

如果我检查chrome网络控制台,请求的状态就可以了.但是在预览选项卡中,它显示来自服务器的JSON,然后附加以下字符串"尝试代理时发生错误:localhost:4200/api/v1/login"

{"name":"something","id":"12sde"}Error occured while trying to proxy to: localhost:4200/api/v1/login

因为JSON解析会出错.

为什么问题有时发生而不是总是？那实际问题是什么？

PS:我正在使用角度 - 4.0.0,angular-cli 1.0.2

Answer 1

当您使用 Angular CLI 时，您正在使用 Webpack 开发服务器：链接到他们的 Github。您所做的就是将代理文件的路径传递到 CLI，然后 CLI 会下载它并将其传递到 webpack-dev-server。

关于这个问题，据报道删除“/api/*”中的 * 可能会解决您的问题。