Node Request Piping set response header

Question

I am streaming a file upload in node.js and then piping the response back to the client. I want to set the content-type on the final response, but can't seem to find in the docs.

req.pipe(proxyReq).pipe(res);

I've tried

res.header('content-type', 'text/plain');

But the response gets set back to 'application/json'.

Is there good docs to how this is working and how I can set the response header?

Answer 1

the piped response is where the headers are being grabbed from so simply setting:

proxyReq.response = res;

fixed it.

Answer 2

For anyone still experiencing this problem. This is how I fixed it:

  const x = _request.pipe(proxyReq);
  x.end();

  x.on("response",(res)=>{
    const routedResp = res.pipe(response);
    routedResp.setHeader("content-type","application/json");
  })

_request and response being the middleware passed parameters. request being 'http.request'.