// Pin publicobject.com's cert.
    client =
      client.newBuilder()
        .certificatePinner(
          CertificatePinner.Builder()
            .add(server.hostName, "sha1/DmxUShsZuNiqPQsX2Oi9uv2sCnw=")
            .build(),
        )
        .build()

    // When we pin the wrong certificate, connectivity fails.
    val request = Request.Builder().url(server.url("/")).build()