如何从Nest固定服务器中创建的中间件发送响应？

问题描述

我已经用Fastify创建了一个nestJs项目，并为其创建了一个中间件，但是我无法弄清楚如何向客户端发送响应，就像我们在快递中可以做的那样，任何帮助都是感谢，谢谢！这是我的中间件代码：

import {
  Injectable,nestMiddleware,HttpException,HttpStatus,} from '@nestjs/common';

@Injectable()
export class LoggerMiddleware implements nestMiddleware {
  use(req: any,res: any,next: Function) {
    console.log('Request...',res);
    // throw new HttpException('Forbidden',HttpStatus.FORBIDDEN);
    next();
  }
}

解决方法

看起来像void Main() { string column1 = "Worknumber"; string column2 = "Username"; DataTable table = new DataTable(); table.Columns.Add(column1,typeof(int)); table.Columns.Add(column2,typeof(string)); table.Rows.Add(1234,"john"); table.Rows.Add(1235,"Mike"); table.Rows.Add(1235,"Mike"); table.Rows.Add(1236,"Donald"); table.Rows.Add(1236,"Jack"); table.Rows.Add(1237,"Val"); table.Rows.Add(1237,"Nick"); var result = table.AsEnumerable() .GroupBy(x => x.Field<int>(column1)) .Where(g => g.Count() > 1 && g.GroupBy(x => x.Field<string>(column2)).Count() > 1) .Select(x => new {WorkNumber = x.Key,AllUsers = string.Join(" ",x.Select(u => u.Field<string>(column2)))}).Dump(); } 抽象使用NodeJS vanila Fastify对象（此处注入的http是http,ServerResponse）

res

// app.middleware.ts

import { Injectable,NestMiddleware } from '@nestjs/common';
import { ServerResponse,IncomingMessage } from 'http';

@Injectable()
export class AppMiddleware implements NestMiddleware {
  use(req: IncomingMessage,res: ServerResponse,next: Function) {
    res.writeHead(200,{ 'content-type': 'application/json' })
    res.write(JSON.stringify({ test: "test" }))
    res.end()
  }
}