message: Fix error in dev mode
diff: @@ -159,6 +159,10 @@ function multipleSPA(options: MultipleSPAOptions): Plugin {
  const url = req.originalUrl
  const firstLevelDir = url?.slice(1).split('/')[0]
  + if (url && /\?.*html-proxy/.test(url)) {
  + return next()
  + }
  +
  if (url === '/') {
  res.writeHead(302, { Location: '/' + options.defaultSite })
  res.end()
  