From 8a0bc5271782c822b6589accc9fe15051b2f5e90 Mon Sep 17 00:00:00 2001
From: Victor Berchet <victor@suumit.com>
Date: Wed, 23 Jul 2025 10:22:53 +0200
Subject: [PATCH] fix skew protection handling of POST requests

---
 .changeset/wet-peaches-speak.md                          | 5 +++++
 packages/cloudflare/src/cli/templates/skew-protection.ts | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/wet-peaches-speak.md

diff --git a/.changeset/wet-peaches-speak.md b/.changeset/wet-peaches-speak.md
new file mode 100644
index 00000000..685069ee
--- /dev/null
+++ b/.changeset/wet-peaches-speak.md
@@ -0,0 +1,5 @@
+---
+"@opennextjs/cloudflare": patch
+---
+
+fix skew protection handling of POST requests
diff --git a/packages/cloudflare/src/cli/templates/skew-protection.ts b/packages/cloudflare/src/cli/templates/skew-protection.ts
index ed231d86..f18f2dc3 100644
--- a/packages/cloudflare/src/cli/templates/skew-protection.ts
+++ b/packages/cloudflare/src/cli/templates/skew-protection.ts
@@ -62,7 +62,11 @@ export function maybeGetSkewProtectionResponse(request: Request): Promise<Respon
 		url.hostname = hostname;
 		const requestToOlderDeployment = new Request(url!, request);
 
-		return fetch(requestToOlderDeployment);
+		// Remove the origin header to prevent an error with POST requests
+		const headers = new Headers(request.headers);
+		headers.delete("origin");
+
+		return fetch(requestToOlderDeployment, { headers });
 	}
 }