Socket.io客户端连接到服务器，但会立即触发；连接“U错误”；事件和连续重新连接

问题是socket.io客户端建立了到服务器的连接（在nginx反向代理之后），但是“connect\u error”回调会立即在客户端上触发。在本地主机上，服务器运行正常，但在服务器上，它没有建立正确的连接

其他信息：

io = require("socket.io-client");

const socket = io.connect("https://api.messboot.at/socket.io", {
  transports: ["websocket"],
});

socket.on("connect_error", (error) => {
  console.log("connection error!");
  console.log(error);
});

import { Logger } from '@nestjs/common';
import { Socket, Server } from 'socket.io';
import {
  MessageBody,
  OnGatewayConnection,
  OnGatewayDisconnect,
  OnGatewayInit,
  SubscribeMessage,
  WebSocketGateway,
  WebSocketServer,
} from '@nestjs/websockets';
import { GpsDTO } from '@dto/gps.dto';
import { GpsService } from '@services/gps/gps.service';

interface GpsMessage {
  timestamp_executed: string;
  session_id: string;
  latitude: number;
  longitude: number;
  speed: number;
  accuracy: number;
}

@WebSocketGateway(8000, {
  transport: ['websocket'],
  allowUpgrades: false,
  //namespace: '/socket.io/gps',
})
export class GPSGateway
  implements OnGatewayInit, OnGatewayConnection, OnGatewayDisconnect {
  constructor(private service: GpsService) {}
  private logger: Logger = new Logger('WebsocketGateway');

  @WebSocketServer() wss: Server;

  afterInit(server: Server) {
    this.logger.log('Initialized:');
  }

  handleConnection(client: Socket) {
    this.logger.log(`Client with id: ${client.id} connected!`);
  }

  handleDisconnect(client: Socket) {
    this.logger.log(`Client with id: ${client.id} disconnected!`);
  }

  @SubscribeMessage('to_server')
  handleMessage(@MessageBody() message: GpsMessage): void {
    this.wss.emit('from_server', message);
    const gps_data: GpsMessage = {
      timestamp_executed: message.timestamp_executed,
      session_id: message.session_id,
      latitude: message.latitude,
      longitude: message.longitude,
      speed: message.speed,
      accuracy: message.accuracy,
    };

    this.service.saveGpsDto(GpsDTO.from(gps_data));
    console.log(message);
  }
}

[Nest] 30   - 05/12/2021, 8:39:49 AM   [WebsocketGateway] Client with id: FKwbAKhcTWvBFrPAAABM connected!

socket.io服务器和反向代理都是固定的。TCP握手似乎有效，但问题是“connect_error”回调立即被访问，客户端开始一次又一次地重新连接

客户端代码：

io = require("socket.io-client");

const socket = io.connect("https://api.messboot.at/socket.io", {
  transports: ["websocket"],
});

socket.on("connect_error", (error) => {
  console.log("connection error!");
  console.log(error);
});

import { Logger } from '@nestjs/common';
import { Socket, Server } from 'socket.io';
import {
  MessageBody,
  OnGatewayConnection,
  OnGatewayDisconnect,
  OnGatewayInit,
  SubscribeMessage,
  WebSocketGateway,
  WebSocketServer,
} from '@nestjs/websockets';
import { GpsDTO } from '@dto/gps.dto';
import { GpsService } from '@services/gps/gps.service';

interface GpsMessage {
  timestamp_executed: string;
  session_id: string;
  latitude: number;
  longitude: number;
  speed: number;
  accuracy: number;
}

@WebSocketGateway(8000, {
  transport: ['websocket'],
  allowUpgrades: false,
  //namespace: '/socket.io/gps',
})
export class GPSGateway
  implements OnGatewayInit, OnGatewayConnection, OnGatewayDisconnect {
  constructor(private service: GpsService) {}
  private logger: Logger = new Logger('WebsocketGateway');

  @WebSocketServer() wss: Server;

  afterInit(server: Server) {
    this.logger.log('Initialized:');
  }

  handleConnection(client: Socket) {
    this.logger.log(`Client with id: ${client.id} connected!`);
  }

  handleDisconnect(client: Socket) {
    this.logger.log(`Client with id: ${client.id} disconnected!`);
  }

  @SubscribeMessage('to_server')
  handleMessage(@MessageBody() message: GpsMessage): void {
    this.wss.emit('from_server', message);
    const gps_data: GpsMessage = {
      timestamp_executed: message.timestamp_executed,
      session_id: message.session_id,
      latitude: message.latitude,
      longitude: message.longitude,
      speed: message.speed,
      accuracy: message.accuracy,
    };

    this.service.saveGpsDto(GpsDTO.from(gps_data));
    console.log(message);
  }
}

[Nest] 30   - 05/12/2021, 8:39:49 AM   [WebsocketGateway] Client with id: FKwbAKhcTWvBFrPAAABM connected!

Socket.io服务器代码：

io = require("socket.io-client");

const socket = io.connect("https://api.messboot.at/socket.io", {
  transports: ["websocket"],
});

socket.on("connect_error", (error) => {
  console.log("connection error!");
  console.log(error);
});

import { Logger } from '@nestjs/common';
import { Socket, Server } from 'socket.io';
import {
  MessageBody,
  OnGatewayConnection,
  OnGatewayDisconnect,
  OnGatewayInit,
  SubscribeMessage,
  WebSocketGateway,
  WebSocketServer,
} from '@nestjs/websockets';
import { GpsDTO } from '@dto/gps.dto';
import { GpsService } from '@services/gps/gps.service';

interface GpsMessage {
  timestamp_executed: string;
  session_id: string;
  latitude: number;
  longitude: number;
  speed: number;
  accuracy: number;
}

@WebSocketGateway(8000, {
  transport: ['websocket'],
  allowUpgrades: false,
  //namespace: '/socket.io/gps',
})
export class GPSGateway
  implements OnGatewayInit, OnGatewayConnection, OnGatewayDisconnect {
  constructor(private service: GpsService) {}
  private logger: Logger = new Logger('WebsocketGateway');

  @WebSocketServer() wss: Server;

  afterInit(server: Server) {
    this.logger.log('Initialized:');
  }

  handleConnection(client: Socket) {
    this.logger.log(`Client with id: ${client.id} connected!`);
  }

  handleDisconnect(client: Socket) {
    this.logger.log(`Client with id: ${client.id} disconnected!`);
  }

  @SubscribeMessage('to_server')
  handleMessage(@MessageBody() message: GpsMessage): void {
    this.wss.emit('from_server', message);
    const gps_data: GpsMessage = {
      timestamp_executed: message.timestamp_executed,
      session_id: message.session_id,
      latitude: message.latitude,
      longitude: message.longitude,
      speed: message.speed,
      accuracy: message.accuracy,
    };

    this.service.saveGpsDto(GpsDTO.from(gps_data));
    console.log(message);
  }
}

[Nest] 30   - 05/12/2021, 8:39:49 AM   [WebsocketGateway] Client with id: FKwbAKhcTWvBFrPAAABM connected!

服务器日志：

io = require("socket.io-client");

const socket = io.connect("https://api.messboot.at/socket.io", {
  transports: ["websocket"],
});

socket.on("connect_error", (error) => {
  console.log("connection error!");
  console.log(error);
});

import { Logger } from '@nestjs/common';
import { Socket, Server } from 'socket.io';
import {
  MessageBody,
  OnGatewayConnection,
  OnGatewayDisconnect,
  OnGatewayInit,
  SubscribeMessage,
  WebSocketGateway,
  WebSocketServer,
} from '@nestjs/websockets';
import { GpsDTO } from '@dto/gps.dto';
import { GpsService } from '@services/gps/gps.service';

interface GpsMessage {
  timestamp_executed: string;
  session_id: string;
  latitude: number;
  longitude: number;
  speed: number;
  accuracy: number;
}

@WebSocketGateway(8000, {
  transport: ['websocket'],
  allowUpgrades: false,
  //namespace: '/socket.io/gps',
})
export class GPSGateway
  implements OnGatewayInit, OnGatewayConnection, OnGatewayDisconnect {
  constructor(private service: GpsService) {}
  private logger: Logger = new Logger('WebsocketGateway');

  @WebSocketServer() wss: Server;

  afterInit(server: Server) {
    this.logger.log('Initialized:');
  }

  handleConnection(client: Socket) {
    this.logger.log(`Client with id: ${client.id} connected!`);
  }

  handleDisconnect(client: Socket) {
    this.logger.log(`Client with id: ${client.id} disconnected!`);
  }

  @SubscribeMessage('to_server')
  handleMessage(@MessageBody() message: GpsMessage): void {
    this.wss.emit('from_server', message);
    const gps_data: GpsMessage = {
      timestamp_executed: message.timestamp_executed,
      session_id: message.session_id,
      latitude: message.latitude,
      longitude: message.longitude,
      speed: message.speed,
      accuracy: message.accuracy,
    };

    this.service.saveGpsDto(GpsDTO.from(gps_data));
    console.log(message);
  }
}

[Nest] 30   - 05/12/2021, 8:39:49 AM   [WebsocketGateway] Client with id: FKwbAKhcTWvBFrPAAABM connected!

有人知道问题出在哪里吗？

---

提前感谢…

问题在于客户端和服务器不兼容，因为socket.io的nestjs依赖项依赖于socket.io的版本2.x.x和客户端（socket.io的版本3）一次又一次地尝试重新连接，但直到我在Github上发现一个与此相关的问题之前，并没有明确的迹象表明为什么会发生这种情况。Nestjs已宣布在其下一个主要版本（V8）中支持socket.io版本3，直到有一个适配器代码可供使用：