Re: [whatwg/url] Allow `//` when base exists (#553)

Wouldn't it be extremely confusing that `//` would have very different behavior from `//a`?

Looking at https://github.com/nodejs/node/issues/35458 I think what you  want is something like this
```js
let finalURL = null;
try {
  finalURL = new URL(req.url);
} catch (e) {
  if (req.url.startsWith("/") {
    finalURL = new URL(`http://${req.headers.host}${req.url}`); // can you trust .host though?
  }
}
```
but it's worth clarifying with the HTTP specification what the exact behavior should be there (e.g., this does not account for `*`).

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