Using undici to make Anthropic API accessible even behind a proxy

[r-yoshihara-j]

Overview

With the following implementation, you can now use the Anthropic provider even in corporate proxy environments or settings that require proxy configuration. (Note: Communication through browsers launched by playwright is not covered by this implementation, so tests using addresses other than localhost may not display correctly)

Steps

1. Install undici

pnpm add undici

2. Add the following to shortest.config.ts

import type { ShortestConfig } from "@antiwork/shortest";
import { setGlobalDispatcher, EnvHttpProxyAgent } from "undici";

if (process.env.HTTPS_PROXY || process.env.HTTP_PROXY) {
  setGlobalDispatcher(new EnvHttpProxyAgent());
}
// ... existing code ...

3. Configure environment settings according to your environment

• HTTP_PROXY
• HTTPS_PROXY
• NO_PROXY
• NODE_EXTRA_CA_CERTS (if needed for custom certificates)

Additional Information

The AI SDK uses the fetch function to communicate with the Anthropic API, and undici configures proxy settings for the global fetch function from environment variables. Therefore, following the steps above allows communication with the Anthropic API even when behind a proxy.