我正在使用 nestjs創(chuàng)建平均堆棧應(yīng)用程序。在 nest js 中，我使用的是 websockets。我不知道如何在 postman 中測(cè)試 websockets。通常我在郵遞員中有測(cè)試路由 url 并得到 o/p 喜歡：“ http://localhost:3000/ {routeUrl}”但是如何使用套接字我很困惑例子 ：@WebSocketGateway() export class MessagesGateway implements  OnGatewayDisconnect {  constructor(@InjectModel(Message) private readonly messagesModel: ModelType<Message>,               @InjectModel(Room) private readonly roomsModel: ModelType<Room>,               @InjectModel(User) private readonly usersModel: ModelType<User>) { // <1>   }   async handleDisconnect(client: Socket) { // <2>     const user = await this.usersModel.findOne({clientId: client.id});     if (user) {       client.server.emit('users-changed', {user: user.nickname, event: 'left'});       user.clientId = null;       await this.usersModel.findByIdAndUpdate(user._id, user);     }   }   @SubscribeMessage('enter-chat-room') // <3>   async enterChatRoom(client: Socket, data: { nickname: string, roomId: string }) {     let user = await this.usersModel.findOne({nickname: data.nickname});     if (!user) {       user = await this.usersModel.create({nickname: data.nickname, clientId: client.id});     } else {       user.clientId = client.id;       user = await this.usersModel.findByIdAndUpdate(user._id, user, {new: true});     }     client.join(data.roomId).broadcast.to(data.roomId)       .emit('users-changed', {user: user.nickname, event: 'joined'}); // <3>   }   @SubscribeMessage('leave-chat-room') // <4>   async leaveChatRoom(client: Socket, data: { nickname: string, roomId: string }) {     const user = await this.usersModel.findOne({nickname: data.nickname});     client.broadcast.to(data.roomId).emit('users-changed', {user: user.nickname, event: 'left'}); // <3>     client.leave(data.roomId);   }