sandbox-agent/docs/cors.mdx
2026-02-11 06:43:52 -08:00

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---
title: "CORS Configuration"
description: "Configure CORS for browser-based applications."
sidebarTitle: "CORS"
---
When calling the Sandbox Agent server from a browser, CORS (Cross-Origin Resource Sharing) controls which origins can make requests.
## Default Behavior
By default, no CORS origins are allowed. You must explicitly specify origins for browser-based applications:
```bash
sandbox-agent server \
--cors-allow-origin "http://localhost:5173"
```
<Note>
The built-in Inspector UI at `/ui/` is served from the same origin as the server, so it does not require CORS configuration.
</Note>
## Options
| Flag | Description |
|------|-------------|
| `--cors-allow-origin` | Origins to allow |
| `--cors-allow-method` | HTTP methods to allow (defaults to all if not specified) |
| `--cors-allow-header` | Headers to allow (defaults to all if not specified) |
| `--cors-allow-credentials` | Allow credentials (cookies, authorization headers) |
## Multiple Origins
Specify the flag multiple times to allow multiple origins:
```bash
sandbox-agent server \
--cors-allow-origin "http://localhost:5173" \
--cors-allow-origin "http://localhost:3000"
```
## Restricting Methods and Headers
By default, all methods and headers are allowed. To restrict them:
```bash
sandbox-agent server \
--cors-allow-origin "https://your-app.com" \
--cors-allow-method "GET" \
--cors-allow-method "POST" \
--cors-allow-header "Authorization" \
--cors-allow-header "Content-Type" \
--cors-allow-credentials
```