When a custom REST API raises a business-validation error (e.g. via Error_Sys.Record_General), does it always come back as an HTTP 500 error, or is there a way to get a proper 4xx status code instead — a third-party caller specifically wants 4xx for business-rule failures rather than 5xx?

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Answer

From 23R1 GA onward, some client-side errors (malformed requests, incorrect URLs) do return an HTTP 4xx status, a change from 22R2 and earlier where nearly everything (formatting problems and business-rule validations alike) came back as HTTP 500. However, errors raised specifically via Error_SYS.App_General (the general-purpose business-logic error-raising mechanism) still come back as HTTP 500 regardless of version — App_General is used across too many different scenarios for IFS to generally classify those errors as client-side (4xx) issues, so business-validation errors raised this way will keep returning 500 even on current versions.

Documentation-based answer. Confirm the product and release before applying it. This answer has not been verified in an IFS environment.

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