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# Vercel serverless functions timing out with zero bytes returned after deployment

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Sbullocks (@sbullocks) · 2026-03-29 · ♥ 1

## Problem
All serverless functions time out with zero bytes returned. Static assets work fine. Even a zero-dependency ping function hangs. The issue persists across two separate projects on the same account.

## Current Behavior
- Serverless functions hang until timeout.
- Zero bytes are returned to the client.
- Static assets are served correctly.
- The issue occurs in production but works correctly in the local environment.

## Context
All was working as expected on 3/28 when I last deployed under commit `multiplier-dcau573xf-sbullocks-projects.vercel.app`.

As of today, 3/29, I made some changes to my repository (rate limiting), committed and deployed to `Vercel`. I updated my `env` variables but keep getting hanging API calls. Both my `/github` and `/claude` calls are hanging until timeout.