3765995 - 9 FAILED_PRECONDITION: Error: HTTP 413 status code returned from external system for external post-hook

• An error occurs when opening an instance of an in C4C V2.
• Error message: "9 FAILED_PRECONDITION: Error: HTTP 413 status code returned from external system for external post-hook"

• Product: SAP Service Cloud Version 2
• Extensibility for SAP Sales/Service Cloud

1. Open an instance eg account account in C4C V2.
2. Observe the error raised by the external post-hook configured via CAP service.
3. Check the browser network tab and note status code 523 in some cases.

The external system rejects the request body as too large causing the external post-hook to fail.

1. Verify in the external system (or any gateway/proxy in front of it) that requests from the post-hook are rejected with HTTP 413 (payload too large).
2. Increase the maximum accepted request payload/body size on the external system so it can accept the account payload sent by the post-hook.
3. Alternatively, optimize the external hook registration to reduce the payload by sending only the required fields.
4. Retest opening the account and confirm the external hook responds successfully (no 413/523).
5. Monitor logs to ensure stable behavior after the change.

http 413, payload too large, external hook, post-hook, validatecustomer, account open error, c4c v2, SAP service cloud v2, cap, capm, external system, status code 523, outbound configuration, payload size limit, sap.crm.md.accountservice , KBA , CEC-CRM-CZM-EXT , Extensibility for SAP Sales/Service Cloud , Problem