From 621aa65b91007bebce2e72c541368348f02c954c Mon Sep 17 00:00:00 2001
From: Theodore Li <theodoreqili@gmail.com>
Date: Wed, 8 Apr 2026 12:30:12 -0700
Subject: [PATCH] fix(webhook): throw webhook errors as 4xxs (#4050)

* fix(webhook): throw webhook errors as 4xxs

* Fix shadowing body var

---------

Co-authored-by: Theodore Li <theo@sim.ai>
---
 apps/sim/lib/webhooks/processor.ts | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/apps/sim/lib/webhooks/processor.ts b/apps/sim/lib/webhooks/processor.ts
index d75f539ee3..ba20a6c4cb 100644
--- a/apps/sim/lib/webhooks/processor.ts
+++ b/apps/sim/lib/webhooks/processor.ts
@@ -725,7 +725,15 @@ export async function processPolledWebhookEvent(
   try {
     const preprocessResult = await checkWebhookPreprocessing(foundWorkflow, foundWebhook, requestId)
     if (preprocessResult.error) {
-      return { success: false, error: 'Preprocessing failed', statusCode: 500 }
+      const errorResponse = preprocessResult.error
+      const statusCode = errorResponse.status
+      const errorBody = await errorResponse.json().catch(() => ({}))
+      const errorMessage = errorBody.error ?? 'Preprocessing failed'
+      logger.warn(`[${requestId}] Polled webhook preprocessing failed`, {
+        statusCode,
+        error: errorMessage,
+      })
+      return { success: false, error: errorMessage, statusCode }
     }
 
     if (foundWebhook.blockId) {