Wrangler pages rewrites

Single page applications, redirect all routes to a single .html file. Different hostings provide different ways to set this fallback:

Netlify: _redirects:

/*    /index.html   200

Vercel: vercel.json:

{
  "rewrites": [
    { "source": "/(.*)", "destination": "/index.html" }
  ]
}

Github pages: 404.html:

(no extra config needed)

Firebase hosting: firebase.json:

{
  "hosting": {
    "rewrites": [
      { "source": "**", "destination": "/index.html" }
    ]
  }
}

Cloudflare pages: _redirects

/* /index.html 200

While it actually works with wrangler deploy and in production redirects happen (working deployment), there is warning for wrangler dev:

▲ [WARNING] Found 1 invalid redirect rule:

  ▶︎ Valid status codes are 200, 301, 302 (default), 303, 307, or 308. Got 404.
      at dist/_redirects:1 | /* /404.html 404

And this is also despite current docs:

Feature	Support	Example	Notes
Rewrites (other status codes)	NO	/blog/* /blog/404.html 404

This repo is prepared to report this mismatch behavior.