Middleware works in localhost but not when deployed / on server

[half swallow]

Hi @west basalt. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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Hmm, I don't know enough to give you a confident answer yet. However, if you're experiencing issues with middleware working locally but not when deployed, it might be related to several factors not covered in the extracts provided. These could include deployment configurations, environment variables, or differences in the runtime environment between your local setup and the server.

For troubleshooting and ensuring your middleware works as expected both locally and when deployed, consider the following general advice based on Next.js documentation and practices:

1. Review Middleware Deployment Requirements: Ensure that your deployment environment meets all the requirements for running Next.js middleware. Middleware requires access to the incoming request and might have specific runtime requirements. Middleware documentation (https://nextjs.org/docs/middleware) could provide more insights.

2. Environment Variables: Double-check that all necessary environment variables (like NEXT_PUBLIC_SERVER_URL in your code) are correctly set up in your deployment environment. Differences in environment variables between local and production environments can lead to unexpected behavior.

3. Runtime Compatibility: Middleware runs in an Edge runtime that supports a subset of Node.js APIs to ensure low latency. If your middleware or any dependencies use Node.js APIs not supported in this runtime, it might work locally but not when deployed. Review the runtime documentation (https://nextjs.org/docs/advanced-features/middleware#runtime) for more details.

4. Path Matching Configuration: The matcher property in your config object is empty. This property is crucial for defining the paths where the middleware should apply. Ensure you specify the correct paths or patterns your middleware is intended to handle. For example:

   export const config = {
     matcher: '/embed/:path*',
   };
   

   This configures the middleware to run for any path starting with /embed.

5. Debugging and Logs: Utilize server logs and deployment platform's debugging tools to gain insights into what might be going wrong. Look for errors or warnings that could indicate why the middleware isn't behaving as expected.

Since the specific details or errors you're encountering aren't provided, and the extracts don't cover deployment issues directly, these suggestions are based on general best practices for troubleshooting middleware in Next.js. For more detailed guidance, consulting the Next.js Middleware documentation (https://nextjs.org/docs/middleware) directly would be beneficial.

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