From bf3078dd98c91dcfe1f2cc88738204511771d199 Mon Sep 17 00:00:00 2001
From: johnx <johnx@google.com>
Date: Thu, 8 Aug 2024 01:34:15 +0800
Subject: [PATCH] Disable CORS preflight request upon command line flag (#3943)

b/27175039

(cherry picked from commit d4ec2d6773b182a58af143944035d857d169fe3e)
---
 cobalt/loader/cors_preflight.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cobalt/loader/cors_preflight.cc b/cobalt/loader/cors_preflight.cc
index 46172a83de95..5872cae3383f 100644
--- a/cobalt/loader/cors_preflight.cc
+++ b/cobalt/loader/cors_preflight.cc
@@ -244,6 +244,9 @@ bool CORSPreflight::IsPreflightNeeded() {
   if (force_preflight_) {
     return true;
   }
+  if (cors_policy_ == network::kCORSOptional) {
+    return false;
+  }
   // Preflight is not needed if the request method is CORS-safelisted request
   // method and all headers are CORS-safelisted request-header.
   std::vector<std::string> unsafe_headers;