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There are times when a request can arrive for a Python function with headers as a list. One of those examples is this header `x-vercel-proxied-for` which apparently is set twice. Example: `[b'x-vercel-proxied-for', [b'207.81.134.243', b'172.71.147.74']]` I took a quick scan through the other Python server implementations and I don't think any of them manipulate the value of the HTTP headers, the way the ASGI one does so I think we are good there. To reproduce: `curl https://..../ -H "foo: bar" -H "foo: bar"` Will fail. Fixes: https://github.com/vercel/vercel/issues/9132