reverting createRemixHeaders to previous fix for handling multiple cookies

.changeset/few-planets-attend.md

@@ -0,0 +1,5 @@
+---
+"@remix-run/architect": patch
+---
+
+Manually joining headers with semi-colons to avoid differences in Remix and node/undici Headers implementation.

contributors.yml

@@ -114,6 +114,7 @@
 - colinhacks
 - confix
 - coryhouse
+- courey
 - courtyenn
 - craigayre
 - craigglennie

packages/remix-architect/__tests__/server-test.ts

@@ -3,6 +3,7 @@ import path from "node:path";
 import { createRequestHandler as createRemixRequestHandler } from "@remix-run/node";
 import type { APIGatewayProxyEventV2 } from "aws-lambda";
 import lambdaTester from "lambda-tester";
+import { Headers as RemixHeaders } from "@remix-run/web-fetch";
 
 import {
   createRequestHandler,
@@ -230,6 +231,17 @@ describe("architect createRemixHeaders", () => {
         "__session=some_value; __other=some_other_value"
       );
     });
+    it("handles multiple request cookies when using @remix-run/web-fetch", () => {
+      let headers = createRemixHeaders(
+        {},
+        ["__session=some_value", "__other=some_other_value"],
+        //@ts-expect-error
+        RemixHeaders
+      );
+      expect(headers.get("cookie")).toEqual(
+        "__session=some_value; __other=some_other_value"
+      );
+    });
   });
 });
 

packages/remix-architect/package.json

@@ -19,6 +19,7 @@
   "dependencies": {
     "@architect/functions": "^5.2.0",
     "@remix-run/node": "workspace:*",
+    "@remix-run/web-fetch": "^4.4.2",
     "@types/aws-lambda": "^8.10.82"
   },
   "devDependencies": {

packages/remix-architect/server.ts

@@ -77,9 +77,15 @@ export function createRemixRequest(event: APIGatewayProxyEventV2): Request {
 
 export function createRemixHeaders(
   requestHeaders: APIGatewayProxyEventHeaders,
-  requestCookies?: string[]
+  requestCookies?: string[],
+  _Headers?: typeof Headers
 ): Headers {
-  let headers = new Headers();
+  // `_Headers` should only be used for unit testing purposes so we can unit test
+  // the different behaviors of the @remix-run/web-fetch `Headers` implementation
+  // and the node/undici implementation.  See:
+  // https://github.com/remix-run/remix/issues/9657
+  let HeadersImpl = _Headers || Headers;
+  let headers = new HeadersImpl();
 
   for (let [header, value] of Object.entries(requestHeaders)) {
     if (value) {
@@ -88,9 +94,7 @@ export function createRemixHeaders(
   }
 
   if (requestCookies) {
-    for (let cookie of requestCookies) {
-      headers.append("Cookie", cookie);
-    }
+    headers.append("Cookie", requestCookies.join("; "));
   }
 
   return headers;