如何使用 Web 套接字和 Angular CLI 设置代理 [英] How to setup a proxy using web sockets and angular CLI

问题描述

我有一个使用 angular CLI 构建的简单网络应用程序.我希望它使用网络套接字与后端通信.我已经编写了后端，并且已经使用服务器可以在套接字上发送和接收的简单 index.html 页面进行了测试.

I have a simple web app built using the angular CLI. I want it to communicate with a backend using web sockets. I have the backend already written and have tested with a simple index.html page that the server can send and receive on sockets.

在我的 angular-cli 项目中，我设置了一个代理配置文件来设置后端的代理.

In my angular-cli project I have setup a proxy config file to setup a proxy to the backend.

proxy.conf.json

proxy.conf.json

{
  "/sock": {
    "target": "http://localhost:3000",
    "changeOrigin": true,
    "ws": true,
    "logLevel": "debug"
  }
}

然后使用以下命令启动服务器.

Then start the server with the following.

ng serve --proxy-config proxy.conf.json

现在我有一个服务，它只是尝试打开一个套接字并发送一个固定的字符串，我希望看到后端记录该字符串.

For now I have a service that simply attempts to open a socket and send a fixed string which I'm expecting to see logged by the backend.

import { Injectable } from '@angular/core';
import * as io from 'socket.io-client';

@Injectable()
export class ChatService {

  private socket: any;

  constructor() {
    this.socket = io({ 'path': '/sock' });
    this.socket.emit('chat message', 'Hello World from browser!');
   }

}

注意:无论有没有 URL 的/sock 部分，我都做过几次尝试.

Note: I've had several go's at this with and without the /sock part of the url.

我启动了两个服务器.在浏览器中没有控制台错误.但是在 angular CLI web pack 服务器中，我收到以下消息.

I start both servers. Get no console errors in the browser. But in the angular CLI web pack server I get the following messages.

10% building modules 2/2 modules 0 active[HPM] Proxy created: /sock  ->  http://localhost:3000
[HPM] Subscribed to http-proxy events:  [ 'error', 'close' ]

[HPM] GET /sockjs-node/530/z1z3teld/websocket -> http://localhost:3000
[HPM] Upgrading to WebSocket
[HPM] Error occurred while trying to proxy request /sockjs-node/530/z1z3teld/websocket from localhost:4200 to http://localhost:3000 (ECONNRESET) (https://nodejs.org/api/errors.html#errors_common_system_errors)

是否支持网络套接字或者我犯了一个愚蠢的错误?谢谢

Are web sockets supported or have I made a silly mistake? Thanks

推荐答案

我通过一些反复试验设法解决了这个问题.我查看了在后端项目中工作的基本 index.html 页面的控制台.这个后端项目基本上是 socket.io 网站上的聊天服务器演示应用程序.我注意到当它打开网络套接字时，网址如下所示:

I managed to figure it out with a bit of trial and error. I looked at the console for the basic index.html page that works within the backend project. This backend project is basically the chat server demo application on the socket.io website. I noticed that when it opens up the web socket the url looks like the following:

http://localhost:3000/socket.io/EIO=3&transport=websocket&sid=wTvdQTclHXJSUmAmAAAA

所以回到 angular CLI 项目中，我修改了我的代理配置以包含/socket.io/部分，此外还添加了一个通配符.

So back in the angular CLI project I modified my proxy config to include the /socket.io/ part plus also added a wildcard.

{
  "/sock/*": {
    "target": "http://localhost:3000/socket.io/",
    "ws": true,
    "logLevel": "debug"
  }
}

宾果游戏！现在，当构建服务时，它会打开套接字并发出一条消息，我可以在后端看到该消息.

Bingo! Now when the service is constructed it opens the socket and emits a message which I can see logged in the backend.

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