Deno hangs after a while, serving a static file over HTTPS

[gcocatre]

I've set up a rudimentary server on AWS EC2 (Debian Linux) running Deno 1.9.1 with an SSL certificate from Let's Encrypt. It simply serves a static HTML file when dealing with a GET request for "/", and returns a 404 for all other requests.

It works fine for a while, and then starts hanging on all requests after a seemingly random amount of time. The code is the following:

import { listenAndServeTLS } from "https://deno.land/std/http/server.ts";

const options = {
  hostname: "www.example.org",
  port: 443,
  certFile: "./keys/cert.pem",
  keyFile: "./keys/key.pem",
};

const index = await Deno.readTextFile("./static/index.html");
const notFound = await Deno.readTextFile("./static/notfound.html");

listenAndServeTLS(options, (req) =>{ 
  let statusCode, content;
  if (req.url === "/") {
    statusCode = 200;
    content = index;
  } else {
    statusCode = 404;
    content = notFound;
  }

  console.log(`${statusCode} ${req.method} ${req.url}`);
  req.respond({
    status: statusCode,
    headers: new Headers({
      "content-type": "text/html",
    }),
    body: content,
  });
});

After the server starts hanging, curl outputs the following (and hangs as well):

*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to www.example.org (127.0.0.1) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/cert.pem
  CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* Operation timed out after 300401 milliseconds with 0 out of 0 bytes received
* Closing connection 0
curl: (28) Operation timed out after 300401 milliseconds with 0 out of 0 bytes received

Am I doing something wrong? I'm starting a big project based on Deno and this is blocking.

[matt-landers]

Is it possible that the EC2 instance is spinning down? You can set the minimum instances to 0, so you may occasionally experience a cold start.

I'd start by adding logging to see if the request is making it to the server.

[gcocatre]

Is it possible that the EC2 instance is spinning down? You can set the minimum instances to 0, so you may occasionally experience a cold start.

I have an SSH session open on the server and it remains responsive at all times while that happens.

I'd start by adding logging to see if the request is making it to the server.

As shown in my code, Deno outputs all requests it receives. When it starts hanging, it stops outputting anything. Where else would you suggest I look?

[AaronO]

@gcocatre I think this is a duplicate of #9692 and #10049. So #10146 should also fix your issue

[gcocatre]

@AaronO I'm not entirely sure it's the same issue. The static files I use are only 6 kilobytes. Moreover, I've been running version 1.7.0 and I still get the same error, albeit perhaps less frequently.

In any case, I didn't realise it when I posted this issue, but am I not supposed to run Deno's newly released native API anyway?

[ry]

Reopening. Fix revert in #10595. False alarm