404 pages will not be displayed with fallback routes in config

Describe the bug Vue.js app are served with 0.3.0 CLI. When put the fallback routes in config, 404 page is not displayed.

Defined fallback routes following in staticwebapp.config.json.

{
    "navigationFallback": {
        "rewrite": "/index.html",
        "exclude": ["/js/*.{js,map}", "/img/*.{png,jpg,gif}", "/css/*"]
    }
}

To Reproduce

1. Build the Vue application with npm run build
2. Run swa start ./dist
3. Enter the URL of a path that does not exist, for example, http://localhost:4280/abc.
4. You will see a screen with nothing rendered.

Expected behavior 404 page will be displayed.

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Chrome
• Version: 89.0.4389.114

Additional context SWA CLI is 0.3.0 installed via npm

[k-miyake]

@manekinekko I installed CLI from main branch, and the 404 page is displayed, but fallback does not work.

[manekinekko]

Fixed by https://github.com/Azure/static-web-apps-cli/pull/179. @k-miyake can you confirm it’s working for you as expected?