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

h2. Symptom
When calling an Appian Web API using Appian Integration Object, the response is a HTTP 500 error.

h2. Cause
This can cause when the request to the Web API is malformed or contains invalid inputs.

h2. Action
Check to make sure that all parameters being passed are valid, and the request body is property cast using the a!toJson() function.

h2. Affected Version
This article applies to Appian 17.2 and later.