用 nestjs 写微信的自动回复消息功能，一直报错？

1. 为了收到微信服务器的 xml 信息，我写了个 xml 解析的中间件；

import { Injectable, NestMiddleware } from '@nestjs/common' import { Request } from 'express' import * as xml2js from 'xml2js' const parseString = xml2js.parseString const parseXml = (xml: string): any => { return new Promise((resolve, reject) => { parseString(xml, { explicitArray: false }, function (err, result) { if (!err) { resolve(result) } else { reject(err) throw err } }) }) } @Injectable() export class XMLMiddleware implements NestMiddleware { use (req: Request, res: any, next: () => void) { const buffer = [] req.on('data', (data) => { buffer.push(data) }) req.on('end', async () => { console.log(req.query) const msgXml = Buffer.concat(buffer).toString('utf-8') const xmlData = await parseXml(msgXml) req.body = xmlData next() }) } } 

1. 定义的 controller 如下

 @Public() @Post('callback') async postMsg (@Body() body: {xml: any}, @Req() req: Request, @Res() res: Response) { const xml = body.xml if (xml.MsgType.toLowerCase() === 'text') { const fromUserName = xml.FromUserName const toUserName = xml.ToUserName const cOntent= xml.Content const replyXml = await this.weixinService.sendTextMsg(fromUserName, toUserName, content) console.log(replyXml) res.type('application/xml') res.end(replyXml) } } 

1. 当给微信发送消息的时候，是可以拿到微信服务器的 xml 消息的

结果如下

// query 信息 { signature: '5bd7841d375e610c6c78f1219d910acf0e61549d', timestamp: '1668078826', nonce: '1894931224', openid: 'o2gkvuBvc_il-f0As0GjBzlqknJo' } // body 信息 { xml: { ToUserName: 'gh_4440d1e4f1af', FromUserName: 'o2gkvuBvc_il-f0As0GjBzlqknJo', CreateTime: '1668078825', MsgType: 'text', Content: '123123', MsgId: '23881145195544631' } } 

所有实现感觉都没啥问题；但是就是回复不了信息

返回信息如下

// 收到 xml 信息 { xml: { ToUserName: 'gh_4440d1e4f1af', FromUserName: 'o2gkvuBvc_il-f0As0GjBzlqknJo', CreateTime: '1668078825', MsgType: 'text', Content: '123123', MsgId: '23881145195544631' } } // 返回给微信服务器的信息； <xml><ToUserName><![CDATA[o2gkvuBvc_il-f0As0GjBzlqknJo]]></ToUserName><FromUserName><![CDATA[gh_4440d1e4f1af]]></FromUserName><CreateTime>1668078827925</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[123123]]></Content></xml> 

不知道是什么原因导致的回复不了！