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After upgrading to a newer hotfix package on Appian 18.3 or later, the following symptoms occur:
Appian introduced a change via AN-155298 which includes an update to improve security. In particular, the authorization header is now hidden when invoking web API calls. As this header is now hidden, any existing calls making use of this property will return error messages stating that the field is null or that the parameter is missing.
The change introduced by this hotfix is intentional and aims to improve security. In order to resolve related issues, refactor any expressions or SAIL code referencing the Authorization header in any web API or Connected System objects to no longer access and make use of this property. An example of this would be http!request.header.authorization.
This article applies to Appian 18.3 and later.
Last Reviewed: May 2020
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