Deploying Faststrap Apps

Faststrap apps are FastHTML/ASGI applications. The right deployment platform depends on whether your app needs persistent features such as SSE, WebSockets, background workers, or in-memory process state.

Decision Flow

Does your app need SSE, WebSockets, or background workers?
|
|-- YES -> Railway (easiest) - Fly.io (production) - VPS (full control)
|
`-- NO -- Is your app completely stateless?
          (reads from external DB only, no in-memory dicts)
          |
          |-- YES -> Vercel (recommended) - Cloud Run - AWS Lambda
          |
          `-- NO --> Railway - Render - Fly.io

Platform Comparison

Platform	Type	SSE	Free Tier	Best For
Vercel	Serverless	No	Yes (Generous)	Stateless apps
Railway	PaaS	Yes	Yes ($5 credit)	Easiest deploy, beginners
Render	PaaS	Yes	Yes (sleeps)	Production, free tier caveats
Fly.io	PaaS/Container	Yes	Yes (Generous)	Production + SSE, global
Koyeb	PaaS	Yes	Yes (No sleep)	Always-on free tier
Google Cloud Run	Serverless container	Limited	Yes (2M req/mo)	GCP ecosystem
AWS Lambda	Serverless	No	Yes (1M req/mo)	AWS ecosystem
Hetzner VPS	Infrastructure	Yes	No (EUR 3.29/mo)	Full control, best price/perf

Cloudflare Compatibility

• Cloudflare Pages: No (JS/TS only)
• Cloudflare Workers: No (V8 isolates; Python ASGI apps are not viable here)
• Cloudflare Tunnel: Yes (front any VPS, free, full SSE support)
• Cloudflare CDN/Proxy: Yes (in front of any hosted server)

Serverless requirements

Serverless platforms (Vercel, AWS Lambda, Cloud Run) require:

1. add_bootstrap(app, use_cdn=True) - no local static files
2. Do not call serve() - expose the bare app object
3. App must be stateless - no in-memory dicts, no file writes
4. SSE and WebSockets are not supported on serverless