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This commit adds a new parallel page view counting system that uses `fetch` with `keepalive: true` to POST to a dedicated `/srv/pv` endpoint, gated behind the `use_beacon_for_browser_page_views` site setting.
Unlike the existing deferred tracking (which piggybacks on AJAX headers), the beacon approach sends page view data directly as a JSON body. Both systems run simultaneously when the setting is enabled to allow comparing counts before fully migrating.
Key details:
* New middleware endpoint `POST /srv/pv` short-circuits with 204
* Dedicated `ApplicationRequest` counters (`*_beacon`) track beacon page views separately from the existing browser page view counters
* A separate `:beacon_browser_pageview` DiscourseEvent avoids double-firing with the existing `:browser_pageview` event
* On Ember route transitions, `routeDidChange` sends the beacon. For non-Ember pages (e.g. `/pub/*`), `pageview.js` handles it
Internal topic: t/179398.
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| .. | ||
| anonymous_cache.rb | ||
| crawler_hooks.rb | ||
| csp_script_nonce_injector.rb | ||
| default_headers.rb | ||
| discourse_public_exceptions.rb | ||
| enforce_hostname.rb | ||
| missing_avatars.rb | ||
| omniauth_bypass_middleware.rb | ||
| overload_protections.rb | ||
| processing_request.rb | ||
| request_tracker.rb | ||