HttpProxyMiddleware [ERR_STREAM_WRITE_AFTER_END] when using agent

[twinkle77]

Checks

• [X] I understand project setup issues should be asked on StackOverflow or in GitHub Discussions.
• [X] I updated to latest http-proxy-middleware.

Describe the bug (be clear and concise)

I'm using HttpProxyMiddleware, with those options:

export const httpProxy = createProxyMiddleware({
  agent: new HttpsProxyAgent('http://127.0.01:10701'),
  pathRewrite: {
    '/tob_gateway': '',
  },
  router: () => {
    return 'http://URL_ADDRESSxxxxx';
  },
  secure: false,
  changeOrigin: true,
  on: {
    proxyReq: (proxyReq, req) => {
      const requestBody = (req as unknown as BodyParserLikeRequest)?.body;

      if (!requestBody) {
        return;
      }

      const writeBody = (bodyData: string) => {
        proxyReq.write(bodyData);
      };

      const contentType = proxyReq.getHeader('Content-Type') as string;
      if (
        contentType &&
        (contentType.includes('application/json') ||
          contentType.includes('+json'))
      ) {
        writeBody(JSON.stringify(requestBody));
      }

      if (
        contentType &&
        contentType.includes('application/x-www-form-urlencoded')
      ) {
        writeBody(querystring.stringify(requestBody));
      }
    },
  },
});

I know that the body is empty since I read the stream with express.raw which using bodyParser behind the scenes, but how can I write it back again before its sent? I cant make any request changes on 'onProxyReq', since I get errors like the above, and if I try to change any headers I get [ERR_HTTP_HEADERS_SENT]

I want to write the request body back before I send it to the server

Step-by-step reproduction instructions

1. ...
2. ...

Expected behavior (be clear and concise)

i can to write body when proxyReq event is triggered( use agent option)

How is http-proxy-middleware used in your project?

as a http proxy

What http-proxy-middleware configuration are you using?

export const httpProxy = createProxyMiddleware({
  agent: new HttpsProxyAgent('http://127.0.01:10701'),
  pathRewrite: {
    '/tob_gateway': '',
  },
  router: () => {
    return 'http://URL_ADDRESSxxxxx';
  },
  secure: false,
  changeOrigin: true,
  on: {
    proxyReq: (proxyReq, req) => {
      const requestBody = (req as unknown as BodyParserLikeRequest)?.body;

      if (!requestBody) {
        return;
      }

      const writeBody = (bodyData: string) => {
        proxyReq.write(bodyData);
      };

      const contentType = proxyReq.getHeader('Content-Type') as string;
      if (
        contentType &&
        (contentType.includes('application/json') ||
          contentType.includes('+json'))
      ) {
        writeBody(JSON.stringify(requestBody));
      }

      if (
        contentType &&
        contentType.includes('application/x-www-form-urlencoded')
      ) {
        writeBody(querystring.stringify(requestBody));
      }
    },
  },
});

What OS/version and node/version are you seeing the problem?

mac: 14.4.1
node: v20.15.0

Additional context (optional)

No response