In Bun, the unix option in fetch() lets you send HTTP requests over a unix domain socket.
const unix = "/var/run/docker.sock";
const response = await fetch("http://localhost/info", { unix });
const body = await response.json();
console.log(body); // { ... }
The unix option is a string that specifies the local file path to a unix domain socket. The fetch() function will use the socket to send the request to the server instead of using a TCP network connection. https is also supported by using the https:// protocol in the URL instead of http://.
To send a POST request to an API endpoint over a unix domain socket:
const response = await fetch("https://hostname/a/path", {
unix: "/var/run/path/to/unix.sock",
method: "POST",
body: JSON.stringify({ message: "Hello from Bun!" }),
headers: {
"Content-Type": "application/json",
},
});
const body = await response.json();