feat: add utility for getting internal next url

middleware.ts

@@ -15,6 +15,10 @@ import * as webView from "@/middlewares/webView"
 import { findLang } from "@/utils/languages"
 
 export const middleware: NextMiddleware = async (request, event) => {
+  // auth() overrides the request origin, we need the original for internal rewrites
+  // @see getInternalNextURL()
+  request.headers.set("x-sh-origin", request.nextUrl.origin)
+
   const headers = getDefaultRequestHeaders(request)
   const lang = findLang(request.nextUrl.pathname)
 
@@ -60,6 +64,8 @@ export const middleware: NextMiddleware = async (request, event) => {
         if (_continue) {
           continue
         }
+        // Clean up internal headers
+        result?.headers.delete("x-sh-origin")
         return result
       }
     }