fix(converters): Ensure x-forwarded-proto is set to http when running locally

.changeset/fair-pillows-yawn.md

@@ -0,0 +1,5 @@
+---
+"@opennextjs/aws": patch
+---
+
+fix(expres-dev): Ensure x-forwarded-proto and \_\_NEXT_PRIVATE_ORIGIN is set

packages/open-next/src/overrides/wrappers/express-dev.ts

@@ -34,6 +34,12 @@ const wrapper: WrapperHandler = async (handler, converter) => {
   });
 
   app.all("*paths", async (req, res) => {
+    if (req.protocol === "http" && req.hostname === "localhost") {
+      // This is used internally by Next.js during redirects in server actions. We need to set it to the origin of the request.
+      process.env.__NEXT_PRIVATE_ORIGIN = `${req.protocol}://${req.hostname}`;
+      // This is to make `next-auth` and other libraries that rely on this header to work locally out of the box.
+      req.headers["x-forwarded-proto"] = req.protocol;
+    }
     const internalEvent = await converter.convertFrom(req);
     const streamCreator: StreamCreator = {
       writeHeaders: (prelude) => {