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Configure Next.js global fetch to use optional outbound proxy #624

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Configure Next.js global fetch to use optional outbound proxy #624

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e23b2ee
Configure global fetch proxy from environment
jbeard4 Mar 11, 2026
d008d01
Pin node engine
jbeard4 Mar 11, 2026
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19 changes: 19 additions & 0 deletions instrumentation.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
import { ProxyAgent, setGlobalDispatcher } from "undici";

@chatgpt-codex-connector chatgpt-codex-connector Bot Mar 11, 2026

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P2 Badge Defer undici import until Node runtime is confirmed

The NEXT_RUNTIME guard in register() does not protect edge execution because undici is imported eagerly at module load time. In Next.js instrumentation, this file is evaluated before that guard runs, so any edge runtime context (for example, adding middleware or an edge route) can fail while resolving this Node-oriented dependency, causing build/startup errors before line 8 is reached. Load undici inside the nodejs branch (e.g., dynamic import) so non-Node runtimes never evaluate it.

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function getProxyUrl(): string | undefined {
return process.env.PROXIMO_URL || process.env.HTTPS_PROXY || process.env.HTTP_PROXY;
}

export async function register() {
if (process.env.NEXT_RUNTIME !== "nodejs") {
return;
}

const proxyUrl = getProxyUrl();
if (!proxyUrl) {
return;
}

setGlobalDispatcher(new ProxyAgent(proxyUrl));
console.log("Configured global fetch proxy via environment variable.");
}
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