Browser Run (P12-K)

When env.BROWSER is bound, FluxyChat uses Browser Run Quick Actions for richer link previews on JS-heavy sites.

Wrangler

compatibility_date = "2026-03-24"

[vars]
# Opt-in: quickAction() incurs Browser Run cost (default off in production toml)
BROWSER_ENABLED = "false"

[browser]
binding = "BROWSER"

Set BROWSER_ENABLED=true in .dev.vars or production secrets when you want SPA-safe OG previews via Browser Run.

Requires compatibility date 2026-03-24 or later.

Behavior

fetchOgPreview in message-enrichment.js:

1. If BROWSER_ENABLED is not false and BROWSER is bound → quickAction('markdown', \{ url \}) and parse title/description/image.
2. Fallback → direct HTML fetch + OG meta tags.
3. If HTML fetch is empty but browser is bound → retry markdown path.

SSRF private URLs are blocked in both paths.

Future surfaces

• Screenshot attachments / OG images via browserScreenshotBytes
• HTML→Markdown for exports (room export already uses DB markdown; browser path optional for URL-only content)