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When configuring an Integration Object where the content type of the HTTP request body is specified as JSON (application/json), testing the request returns an "HTTP/1.1 415 Unsupported Media Type" error as depicted below:
When the content type of JSON (application/json) is configured solely in the HTTP request body, charset=UTF-8 is appended to the content type of the request, as request bodies should be UTF-8 encoded. However, certain systems will reject requests in which the body is UTF-8 encoded.
charset=UTF-8
A workaround for this issue was implemented via AN-107124 in Appian 18.1 Hotfix Package D.