message: [cli] Fix `vc login` hanging for a few seconds before exiting
  Closing keep-alive HTTP connections was causing the `server.close()` call
  to take a few seconds before completing, so set the `Connection: close`
  response header in order to make the connections close immediately,
  so that `server.close()` is fast.
diff: @@ -30,6 +30,10 @@ export default async function doOauthLogin(
  const [query] = await Promise.all([
  new Promise<URL['searchParams']>((resolve, reject) => {
  server.once('request', (req, res) => {
  + // Close the HTTP connection to prevent
  + // `server.close()` from hanging
  + res.setHeader('connection', 'close');
  +
  const query = new URL(req.url || '/', 'http://localhost')
  .searchParams;
  resolve(query);
  