TLS handshake error in PostgreSQL metric

Issue in Postgresql metric.

Test case attached.

In my case postgresql:metrics status is OK, but log showing reported error. SSL is enabled on postgresql server.

time="2018-10-08T20:16:52+05:30" level=info msg="Starting node_exporter (version=, branch=, revision=)" source="postgres_exporter.go:1132"
time="2018-10-08T20:16:52+05:30" level=info msg="Build context (go=go1.10.1, user=, date=)" source="postgres_exporter.go:1133"
time="2018-10-08T20:16:52+05:30" level=info msg="Established new database connection." source="postgres_exporter.go:1015"
time="2018-10-08T20:16:52+05:30" level=info msg="Semantic Version Changed: 0.0.0 -> 10.5.0" source="postgres_exporter.go:945"
time="2018-10-08T20:16:52+05:30" level=info msg="Starting HTTPS server for https://172.17.0.1:42005/metrics ..." source="server.go:106"
2018/10/08 20:24:18 http: TLS handshake error from 172.17.0.1:47646: tls: first record does not look like a TLS handshake