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| title: Pi Web Preview | |
| emoji: 🪟 | |
| colorFrom: gray | |
| colorTo: gray | |
| sdk: docker | |
| app_port: 7860 | |
| pinned: false | |
| short_description: Direct previews of dev servers for Pi Web | |
| # Pi Web previews | |
| The origin that [Pi Web](https://mike0021-pi-web.hf.space) frames to show a user's own dev | |
| server (for example a Vite app on their machine's port 5173) natively, on a different site from | |
| Pi Web so app code can never act with the user's Pi Web session. | |
| There is nothing to open here directly: Pi Web asks its gateway for a capability link | |
| (`/__pv/<cap>/`), this Space keeps it in a partitioned, HttpOnly cookie and relays every request | |
| to the gateway, which checks the capability and forwards to that user's machine only. | |
| Plain HTTP and server-sent events stream both ways; WebSocket upgrades (hot module reload | |
| sockets) are not supported. Only Pi Web may frame these pages (`frame-ancestors`). | |
| Configuration: secret `PREVIEW_RELAY_SECRET` (shared with the gateway Space), optional variables | |
| `PREVIEW_GATEWAY` (default `https://mike0021-pi-web.hf.space`) and `PREVIEW_FRAME_ANCESTORS`. | |