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Support Article

Third party site is unable to access REST service in PROD



User is hosting a REST service. External website is unable to call this through AJAX and they are receiving error with production environment.

Error Messages

Response to preflight does not pass access control check,'Access -Control-Allow-Origin' header is present on the requested resource

Steps to Reproduce

Not applicable

Root Cause

A defect or configuration issue in the operating environment where user's Production environment is on Pega 7.2.1 and developer environment is on Pega 7.3.1
Note that support of  Pre-Flight Requests Failing for custom APIs have started Pega 7.3 onwards.


Here’s the explanation for the reported behavior: Upgrade the environment to Pega 7.3 or later releases.

Published July 26, 2018 - Updated October 8, 2020

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