---
title: INTERNAL_CACHE_KEY_TOO_LONG
product: vercel
url: /docs/errors/INTERNAL_CACHE_KEY_TOO_LONG
canonical_url: "https://vercel.com/docs/errors/INTERNAL_CACHE_KEY_TOO_LONG"
last_updated: 2026-02-09
type: reference
prerequisites:
  []
related:
  []
summary: The CDN is failing to fetch from the internal cache due to a cache key being too long. This error can be caused by a request URL that is too long.
install_vercel_plugin: npx plugins add vercel/vercel-plugin
---

# INTERNAL_CACHE_KEY_TOO_LONG

The `INTERNAL_CACHE_KEY_TOO_LONG` error occurs when the CDN is unable to fetch from the internal cache due to a cache key being too long. This error can be caused by a request URL that is too long.

**Error Code:** `500`

**Name:** Internal Server Error

## Troubleshoot

To troubleshoot this error, follow these steps:

1. **Contact support:** If the error persists, [contact support](/help#issues) for further assistance


---

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