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Every sandbox has access to the internet and can be reached by a public URL.

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Controlling internet access

You can control whether a sandbox has access to the internet by using the allowInternetAccess parameter when creating a sandbox. By default, internet access is enabled (true), but you can disable it for security-sensitive workloads. 
import { Sandbox } from '@e2b/code-interpreter'

// Create sandbox with internet access enabled (default)
const sandbox = await Sandbox.create({ allowInternetAccess: true })

// Create sandbox without internet access
const isolatedSandbox = await Sandbox.create({ allowInternetAccess: false })
When internet access is disabled, the sandbox cannot make outbound network connections, which provides an additional layer of security for sensitive code execution.

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Sandbox public URL

Every sandbox has a public URL that can be used to access running services inside the sandbox. 
import { Sandbox } from '@e2b/code-interpreter'

const sandbox = await Sandbox.create()

// You need to always pass a port number to get the host
const host = sandbox.getHost(3000) // $HighlightLine
console.log(`https://${host}`)
The code above will print something like this: 
https://3000-i62mff4ahtrdfdkyn2esc-b0b684e9.e2b.dev
The first leftmost part of the host is the port number we passed to the method.

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Connecting to a server running inside the sandbox

You can start a server inside the sandbox and connect to it using the approach above. In this example we will start a simple HTTP server that listens on port 3000 and responds with the content of the directory where the server is started. 
import { Sandbox } from '@e2b/code-interpreter'

const sandbox = await Sandbox.create()

// Start a simple HTTP server inside the sandbox.
const process = await sandbox.commands.run('python -m http.server 3000', { background: true })
const host = sandbox.getHost(3000)
const url = `https://${host}`
console.log('Server started at:', url)

// Fetch data from the server inside the sandbox.
const response = await fetch(url);
const data = await response.text();
console.log('Response from server inside sandbox:', data);

// Kill the server process inside the sandbox.
await process.kill()
This output will look like this: 
Server started at: https://3000-ip3nfrvajtqu5ktoxugc7-b0b684e9.e2b.dev
Response from server inside sandbox: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Directory listing for /</title>
</head>
<body>
<h1>Directory listing for /</h1>
<hr>
<ul>
<li><a href=".bash_logout">.bash_logout</a></li>
<li><a href=".bashrc">.bashrc</a></li>
<li><a href=".profile">.profile</a></li>
</ul>
<hr>
</body>
</html>
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