<ul><li>When using a Next.js frontend with FastAPI backend, it's crucial to ensure all parameters are sent correctly, including URLs.</li><li>Reasons why the URLs parameter might show up as None in FastAPI include incorrect FormData structure and form parameter handling.</li><li>To resolve the issue, ensure proper FormData appending and validate the FastAPI endpoint by correctly handling the URLs parameter.</li><li>Debugging options include checking FormData structure and parsing the URLs parameter in the FastAPI endpoint for proper data reception.</li></ul>

Why is the URL parameter None in FastAPI from Next.js?

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