Record proxied sites' markdown, llms.txt and RSS requests under their public URL (#4660)

.changeset/insights-canonical-url.md

@@ -0,0 +1,5 @@
+---
+"gitbook": patch
+---
+
+Track server-side Insights events (markdown, llms.txt, RSS, ask) with the site's public URL instead of the proxy URL.

packages/gitbook/src/middleware.ts

@@ -508,7 +508,8 @@ async function serveSiteRoutes(requestURL: URL, request: NextRequest) {
                     siteId: siteURLData.site,
                     events,
                     request: {
-                        url: siteRequestURL.toString(),
+                        // A proxied site's request URL is the proxy's (`/sites/site_xxx/...`), not its public one.
+                        url: siteCanonicalURL.toString(),
                         headers: requestHeaders,
                     },
                 })