false | 'index''index'Whether to enable HTML fallback.
By default, when the request meets the following conditions and the corresponding resource is not found, it will fallback to index.html:
GET or HEAD requesttext/html (the request header accept type is text/html or */*)If you do not want to enable HTML fallback, you can set server.htmlFallback to false.
If server.htmlFallback cannot meet your needs, you can use server.historyApiFallback for more flexible settings.