[Blob] File upload hangs indefinitely when file.name contains %

[typeofweb]

When % is present in the name of the file (e.g. lo%go.jpg), put(…) hangs forever.

onUploadProgress is called once with { loaded: 0, total: …, percentage: 0 } and then nothing else happens for a few minutes.

After a few minutes, an error is thrown: Error Vercel Blob: Unknown error, please visit https://vercel.com/help

How to reproduce?

• have an <input type="file" /> in a form (I'm using Next.js so I upload the file with server actions)
• put("path", file)
• observe how put never resolves and the request is left at "Pending" forever