tls_server_config :
cert_file : "testdata/server.crt"
key_file : "testdata/server.key"
client_auth_type : "VerifyClientCertIfGiven"
client_ca_file : "testdata/tls-ca-chain.pem"
cipher_suites:
- TLS_RSA_WITH_AES_128_CBC_SHA
max_version: TLS12