方法在http-代理中间件中不工作，如何修复它？

Question

从一个服务中，我发送一个请求到一个地址，例如http://gateway:3000/users，它使用http中间件库代理到http://webamqplib:5557/。如果我使用函数reverse-proxy-middlewareBuilder.ts，就能工作。

import { Request, Response, NextFunction } from 'express';
import { createProxyMiddleware, Filter, Options, RequestHandler } from 'http-proxy-middleware';
import { MiddlewareBuilder } from '@nestjs/core';

export function ReverseProxyMiddleware(req: Request, res: Response, next: NextFunction) {
   const proxy = createProxyMiddleware(req.path, {
   target: 'http://webamqplib:5557/',
   changeOrigin: true,
})
   proxy(req, res, next)
}

创建的/users -> webamqplib:5557

模块-> users.module.ts

import { Request, Response, NextFunction } from 'express';
import { Injectable, NestMiddleware, Scope } from '@nestjs/common';
import { createProxyMiddleware, Filter, Options, RequestHandler } from 'http-proxy-middleware';
import configs from './config/config.json';

@Injectable()
export class ReverseProxyMiddleware implements NestMiddleware {
  private proxy(path: Filter | Options, option?: Options): RequestHandler {

    return createProxyMiddleware(path, option)
}

use(req: Request, res: Response, next: () => void) {
  this.proxy(
     req.path, 
    {
      target: configs.users.target,
      changeOrigin: true
    }
  )
  next()
}

使用类反向代理-中间件Builder.ts

import { Request, Response, NextFunction } from 'express';
import { Injectable, NestMiddleware } from '@nestjs/common';
import { createProxyMiddleware, Filter, Options, RequestHandler } from 'http-proxy-middleware';
import configs from './config/config.json';

@Injectable()
export class ReverseProxyMiddleware implements NestMiddleware {
  private proxy(path: Filter | Options, option?: Options): RequestHandler {
    return createProxyMiddleware(path, option)
  }

  use(req: Request, res: Response, next: () => void) {
    this.proxy(
    req.path, 
    {
      target: configs.users.target,
      changeOrigin: true
    }
  )
 next()
}
}

当请求http://gateway:3000/users时，控制台仍然显示HPM代理创建的: /users -> webamqplib:5557，就像函数一样，但是重定向不会像第一个示例那样发生在地址上。

在google翻译器的帮助下翻译:)

Answer 1

在您的代码中，您为每个请求创建一个中间件，而不是将其连接一次，然后它将捕获请求。

在您的例子中，您必须在main.ts文件中这样做：

  // main.ts
  import { createProxyMiddleware } from 'http-proxy-middleware';
  ...
  app.use("*", createProxyMiddleware({
    target: 'http://webamqplib:5557',
    changeOrigin: true,
  }));

对我来说是这样的。