feat: Add backlink to booking page (#16778)

* FEAT: Add backlink to booking page

* restrict to cal.com only

---------

Co-authored-by: Peer Richelsen <peeroke@gmail.com>

apps/web/next.config.js

@@ -438,6 +438,22 @@ const nextConfig = {
         // COEP require-corp header is set conditionally when flag.coep is set to true
         headers: [CORP_CROSS_ORIGIN_HEADER],
       },
+      {
+        source: "/:path*",
+        has: [
+          {
+            type: "host",
+            value: "cal.com",
+          },
+        ],
+        headers: [
+          // make sure to pass full referer URL for booking pages
+          {
+            key: "Referrer-Policy",
+            value: "no-referrer-when-downgrade",
+          },
+        ],
+      },
       // These resources loads through embed as well, so they need to have CORP_CROSS_ORIGIN_HEADER
       ...[
         {

packages/lib/constants.ts

@@ -79,7 +79,7 @@ export const ANDROID_CHROME_ICON_256 = "/android-chrome-256x256.png";
 export const ROADMAP = "https://cal.com/roadmap";
 export const DESKTOP_APP_LINK = "https://cal.com/download";
 export const JOIN_COMMUNITY = "https://github.com/calcom/cal.com/discussions";
-export const POWERED_BY_URL = `${WEBSITE_URL}/?utm_source=embed&utm_medium=powered-by-button`;
+export const POWERED_BY_URL = "https://go.cal.com/booking";
 export const DOCS_URL = "https://cal.com/docs";
 export const DEVELOPER_DOCS = "https://developer.cal.com";
 export const SEO_IMG_DEFAULT = `${CAL_URL}/og-image.png`;