I have some investigations and found problem was a missing CA certs for endpoint .
"sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"
Resolved by this recipe https://confluence.atlassian.com/kb/connecting-to-ssl-services-802171215.html
<JAVA_HOME>/bin/keytool -import -alias <server_name> -keystore <JAVA_HOME>/jre/lib/security/cacerts -file public.crt
I managed to execute a POST function using https, and I could see the result on the service that it had been executed correctly.
I would think that the error is not related to the automation engine, but rather the endpoint used. I ain't no expert on https: and SSL certificate, but perhaps the endpoint doesn't support https and just http, in that case, this will fail.
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