Nginx: Client timed out (110: Connection timed out) while waiting for request

Backend Development
1

I have a deployed Nextjs app on my Debian server with pm2, it work well, but when I set the Nginx reverse proxy to set the domain it have a error very specific.

So the backend and frontend work well, I have a POST endpoint here I can upload files(mostly image and pdf)if I do a POST without a file or a tiny file(I did some test and the limit is some close to .1m in the header lenght) this work well, but if I upload a larger file the endpoint doesn’t work.

I check the Nginx error logs and found it
Client timed out (110: Connection timed out) while waiting for request

The error only occurred when I use the app from the domain and not from the server ip.

export async function POST(req: Request) {
  await connectMongoDB();

  const contentLength = req.headers.get("content-length");

  if (contentLength) {
    console.log(`Request size: ${contentLength} bytes`);
  } else {
    console.log("Content-Length header is missing");
  }
  console.log("check0");
  console.log("check0.1");

  const data = await req.formData();
    console.log("check1");

When the error ocurred I get a log

0|nextjs-a | Request size: 150198 bytes
0|nextjs-a | check0
0|nextjs-a | check0.1
2

I don’t know why, but when I POST a buffer array stringify the fetch hangout, but when I send it as a File type without stringify it work, but the hangout only happen on the NGINX proxy with the domain

Thats the solution, if you want upload a file to your api send a File type