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Error 500 when using Appian integration object to call an Appian Web API

Symptom

When calling an Appian Web API using Appian Integration Object, the response is a HTTP 500 error.

Cause

This can cause when the request to the Web API is malformed or contains invalid inputs.

Action

Check to make sure that all parameters being passed are valid, and the request body is property cast using the a!toJson() function.

Affected Version

This article applies to Appian 17.2 and later.