From 329d80075bc788de0c8e757fbd8cd69120fbec99 Mon Sep 17 00:00:00 2001
From: Alan Agius <alanagius@google.com>
Date: Mon, 15 Jan 2024 14:45:10 +0000
Subject: [PATCH] fix(@angular-devkit/build-angular): alllow `OPTIONS` requests
 to be proxied when using `vite`

This commit fixes an issue were `OPTIONS` requests were not being proxied when using Vite dev-server

Closes #26782

(cherry picked from commit 771fdcdc1dce114f6f4600feab47733065e1978b)
---
 .../build_angular/src/builders/dev-server/vite-server.ts      | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/angular_devkit/build_angular/src/builders/dev-server/vite-server.ts b/packages/angular_devkit/build_angular/src/builders/dev-server/vite-server.ts
index 50223585ac60..5dc5cde97e3f 100644
--- a/packages/angular_devkit/build_angular/src/builders/dev-server/vite-server.ts
+++ b/packages/angular_devkit/build_angular/src/builders/dev-server/vite-server.ts
@@ -483,6 +483,10 @@ export async function setupServer(
       open: serverOptions.open,
       headers: serverOptions.headers,
       proxy,
+      cors: {
+        // Allow preflight requests to be proxied.
+        preflightContinue: true,
+      },
       // File watching is handled by the build directly. `null` disables file watching for Vite.
       watch: null,
       fs: {