Port is taken into consideration when selecting proxy host

[Marc Berchtold]

The following log entry explains the situation:

INFO [2021-09-21 08:19:27.307 +0200]: Added proxy host
    host: "dev.xxxxxxx.io"
    container: "speedtest"
    proxy: {
      "host": "localhost",
      "port": 3000
    }
    timeoutSeconds: 10
INFO [2021-09-21 08:19:27.309 +0200]: Proxy listening
    port: 8081
WARN [2021-09-21 08:19:36.010 +0200]: Proxy configuration missing
    host: "dev.xxxxxxx.io:8081"