feat(ai): Support HTTP proxy through environment variables

packages/ai/src/stream.ts

@@ -14,6 +14,15 @@ import type {
 
 export { getEnvApiKey } from "./env-api-keys.js";
 
+// Set up http proxy according to env variables for `fetch` based SDKs in Node.js.
+// Bun has builtin support for this.
+if (typeof process !== "undefined" && process.versions?.node) {
+	import("undici").then((m) => {
+		const { EnvHttpProxyAgent, setGlobalDispatcher } = m;
+		setGlobalDispatcher(new EnvHttpProxyAgent());
+	});
+}
+
 function resolveApiProvider(api: Api) {
 	const provider = getApiProvider(api);
 	if (!provider) {