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Using some hacky methods to print out the args being sent to Popen yields:

self.args= ['/usr/bin/python3', '-m', 'bentoml', 'serve-http', 'iris_classifier:bvrs5fa7ncssplg6', '--host', '0.0.0.0', '--port', '39001', '--backlog', 'None', '--development', '--api-workers', '2048', '--working-dir', '4', '--ssl-keyfile-password', 17, '--ssl-ca-certs', 'TLSv1', '--ssl-ciphers', 'TLSv1']

So it looks like the culprit is ssl-keyfile-password being 17 instead of '17'. How would I go about fixing this?

Hiya, sorry about the delay. Thanks for the PR!