Unable to set sslmode=require parameter on a Postgres connection

Hi

I am trying to connect to a Postgres hosted by Heroku.

https://devcenter.heroku.com/articles/heroku-postgresql#heroku-postgres-ssl

import com.twitter.finagle.Postgres
val client = Postgres.Client()
.withCredentials("xx", Some("xx"))
.database("xx")
.withSessionPool.maxSize(1)
.newRichClient("xx.eu-west-1.compute.amazonaws.com:5432")

returns an error saying ssl is off as expected
com.twitter.finagle.postgres.codec.ServerError: no pg_hba.conf entry for host "82.2.102.2", user "xx", database "xx", SSL off

I am unable to set sslmode=require on the underlying connection. I have tried
val client = Postgres.Client()
.withCredentials("xx", Some("xx"))
.database("xx")
.withSessionPool.maxSize(1)
.conditionally(true, _.withTransport.tlsWithoutValidation)
.withTransport.tls("amazonaws.com")
.newRichClient("xx.eu-west-1.compute.amazonaws.com:5432")

val client = Postgres.Client()
.withCredentials("xx", Some("xx"))
.database("xx")
.withSessionPool.maxSize(1)
.withTransport.tls("amazonaws.com")
.newRichClient("xx.eu-west-1.compute.amazonaws.com:5432")

val client = Postgres.Client()
.withCredentials("xx", Some("xx"))
.database("xx")
.withSessionPool.maxSize(1)
.conditionally(true, _.withTransport.tlsWithoutValidation)
.newRichClient("xx.eu-west-1.compute.amazonaws.com:5432")

Start at the Postgres.Client configuration and the newRichClient connection path, then reproduce the reported Heroku PostgreSQL connection with the supplied examples. The issue is resolved when the client can establish the requested SSL connection instead of receiving an “SSL off” pg_hba.conf error.

Written by the indexing model from the issue text.