Deno 2.1.4 - node:http's http.request socketPath option fails in Deno, but works in Node.

[tenkoverse]

Summary:

• Deno's node:http module behaves differently than Node.js's http module when using http.request with the socketPath option to connect to the Docker socket.
• Instead of connecting to the Docker socket, Deno appears to attempt a TCP connection to http://localhost/info, resulting in an ECONNREFUSED error.
• This discrepancy was discovered while troubleshooting a failure using @testcontainers/postgresql library and was traced down through its dependencies (dockerode, docker-modem) to this minimal reproduction.
• The equivalent code works perfectly in node, indicating a failure in Deno.

Reproduction Steps:

1. Setup:

• Install Docker Desktop on macOS.
• Ensure the Docker daemon is running and accessible via the default Unix socket: /Users/<your_username>/.docker/run/docker.sock (replace <your_username> with your actual username).
• Make sure you have "Allow the default Docker socket to be used" enabled under advanced settings in Docker.

2. Node.js (Correct Behavior):

Create a file named node-test.js with the following content:
Ensure you set "type": "module" in package.json.

import http from "http";

const options = {
  socketPath: "/Users/<your_username>/.docker/run/docker.sock", 
  path: "/info",
  method: "GET",
};

const req = http.request(options, () => {
  console.log(`Success`);
});

req.on("error", (e) => {
  console.error(`Error: ${e.message}`);
});

req.end();

Run: node node-test.js

• Expected Output:

Success

• Actual Output:

Success

3. Deno (Incorrect Behavior):

• Create a file named deno-test.ts with the following content:

import http from "node:http";

const options = {
  socketPath: "/Users/<your_username>/.docker/run/docker.sock", 
  path: "/info",
  method: "GET",
};

const req = http.request(options, () => {
  console.log(`Success`);
});

req.on("error", (e) => {
  console.error(`Error: ${e.message}`);
});

req.end();

Run deno -A deno-test.ts

• Expected Output:

Success

• Actual Output:

Error: error sending request for url (http://localhost/info): client error (Connect): tcp connect error: Connection refused (os error 61): Connection refused (os error 61)

Environment:

deno 2.1.4 (stable, release, x86_64-apple-darwin)
v8 13.0.245.12-rusty
typescript 5.6.2

Docker Desktop: 4.37.2 (179585)

[testersen]

I'm also having this issue.

[lukas-santiago]

With Deno version 2.1.9 it still happens and I'm using WSL Ubuntu 22.04 LTS.

Causing testcontainers to become unusable precisely because of the need to talk to docker in "/var/run/docker.sock".