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RANGE_UNIT_NOT_SUPPORTED

Last updated February 9, 2026

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.

416

RANGE_UNIT_NOT_SUPPORTED:

Requested Range Not Satisfiable

Troubleshoot

AI Assistance

I'm encountering an error and reviewing the docs at https://vercel.com/docs/errors/RANGE_UNIT_NOT_SUPPORTED.md to understand what's happening. Please help me resolve this by: 1. **Suggest the fix**: Analyze my codebase context and propose what needs to be changed to resolve this error. If you do not have access to my codebase, ask me for the codebase and try to fix the error based on the information you have. 2. **Explain the root cause**: Break down why this error occurred: - What was the code actually doing vs. what it needed to do? - What conditions triggered this specific error? - What misconception or oversight led to this? 3. **Teach the concept**: Help me understand the underlying principle: - Why does this error exist and what is it protecting me from? - What's the correct mental model for this concept? - How does this fit into the broader framework/language design? 4. **Show warning signs**: Help me recognize this pattern in the future: - What should I look out for that might cause this again? - Are there similar mistakes I might make in related scenarios? - What code smells or patterns indicate this issue? 5. **Discuss alternatives**: Explain if there are different valid approaches and their trade-offs My goal is to fix the immediate issue while building lasting understanding so I can avoid and resolve similar errors independently in the future.

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

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