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ee/apps/den-web/proxy.ts

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+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+
+const POSTHOG_PROXY_PATH = "/ow";
+const POSTHOG_API_HOST = "us.i.posthog.com";
+const POSTHOG_ASSETS_HOST = "us-assets.i.posthog.com";
+
+export function proxy(request: NextRequest) {
+  const url = request.nextUrl.clone();
+  const { pathname } = url;
+
+  if (!pathname.startsWith(POSTHOG_PROXY_PATH)) {
+    return NextResponse.next();
+  }
+
+  const hostname = pathname.startsWith(`${POSTHOG_PROXY_PATH}/static/`)
+    ? POSTHOG_ASSETS_HOST
+    : POSTHOG_API_HOST;
+  const requestHeaders = new Headers(request.headers);
+
+  requestHeaders.set("host", hostname);
+  requestHeaders.delete("cookie");
+
+  url.protocol = "https";
+  url.hostname = hostname;
+  url.port = "443";
+  url.pathname = pathname.replace(/^\/ow/, "") || "/";
+
+  return NextResponse.rewrite(url, {
+    request: {
+      headers: requestHeaders
+    }
+  });
+}
+
+export const config = {
+  matcher: "/ow/:path*"
+};