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