# RANGE_UNIT_NOT_SUPPORTED

The `RANGE_UNIT_NOT_SUPPORTED` error occurs when the unit identifier of the `Range` header in a request is not supported by the server. The `Range` header is used to request a specific portion of a resource from the server, and the unit identifier indicates the unit in which the range is specified, such as bytes.

## Troubleshoot

To troubleshoot this error, follow these steps:

1. **Verify supported Range units:** Check the documentation for the server or service you are interacting with to determine the supported range units
2. **Correct Range unit:** If the `Range` header in your request specifies an unsupported unit, correct it to use a supported unit
3. **Check configuration:** If the `Range` header values are being set automatically by some part of your system, check the configuration to ensure a supported unit identifier is being used
4. **Debugging:** If the error persists, log the `Range` header values in your server logs to debug and understand what values are being sent in requests


--------------------------------------------------------------------------------
title: "REQUEST_HEADER_TOO_LARGE"
description: "Request header size exceeds the permissible limit."
last_updated: "2026-02-03T02:58:42.176Z"
source: "https://vercel.com/docs/errors/REQUEST_HEADER_TOO_LARGE"
--------------------------------------------------------------------------------