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MICROFRONTENDS_MIDDLEWARE_ERROR

Last updated April 8, 2025

The MICROFRONTENDS_MIDDLEWARE_ERROR error occurs when the middleware returned a header x-vercel-mfe-zone with an invalid value. The value must be a name of an application from microfrontends.json.

Troubleshoot

I'm encountering an error and reviewing the docs at /flg~eyJhbGciOiJIUzI1NiJ9._v7-_v79_Q.kEoXNQUHcA8QCIB_rAf5x6CjUKyoy4GW5y0g6anE81o/docs/errors/MICROFRONTENDS_MIDDLEWARE_ERROR 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 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. If you are setting the header, ensure that the value is a valid application name.
  2. If you are not setting the header, this is an error caused by the @vercel/microfrontends package. Please open an issue and include the error message.

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