Connecting to internet services (passivetotal, virustotal, ...) through a proxy

Our MISP is placed in an internal environment, internet services are only reachable by going through a squid proxy (without any auth, as our MISP IP is whitelisted).
While syncing with other MISP instances in the internet works after configuring the proxy in the "Settings-->Proxy" tab, misp-modules like virustotal, countrycode etc. fail.
Is this not implemented yet, or did I just miss the required step while working through the readme?

www-data@misp:/usr/local/src/misp-modules$ /usr/local/bin/misp-modules
HTTPConnectionPool(host='www.geognos.com', port=80): Max retries exceeded with url: /api/en/countries/info/all.json (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7f35addd2438>: Failed to establish a new connection: [Errno -2] Name or service not known',))
2016-10-05 14:47:25,682 - misp-modules - INFO - Launch MISP modules server from current directory.
2016-10-05 14:47:25,682 - misp-modules - INFO - Helpers loaded cache.py
2016-10-05 14:47:25,686 - misp-modules - INFO - MISP modules ocr imported
2016-10-05 14:47:25,686 - misp-modules - INFO - MISP modules testimport imported
2016-10-05 14:47:25,793 - misp-modules - INFO - MISP modules stiximport imported
2016-10-05 14:47:25,795 - misp-modules - WARNING - MISP modules countrycode failed due to HTTPConnectionPool(host='www.geognos.com', port=80): Max retries exceeded with url: /api/en/countries/info/all.json (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7f35aaf8eb38>: Failed to establish a new connection: [Errno -2] Name or service not known',))

Start with the misp-modules README and the /usr/local/bin/misp-modules entry point, then inspect how the countrycode and other external-service modules make HTTP requests. Reproduce the failure through the squid proxy and verify that the affected modules can reach services such as www.geognos.com when the proxy is configured.