1 - Add support for parsing IPv6 addresses out of data received via webcheck ip url.
3 - Configurable user-agent with version string placeholder (%V?)
5 - HTTP proxy authentication
7 - Improve dealing with problems when update for particular service fails (static failure (Auth data) / temporary failure (DNS) )
8 -> static failure: e.g. disable service.
9 -> temporary failure: e.g. increase idle period for that service.
11 - Add curl HTTP headers to disable proxy caching
13 - On too many update errors: Configurable block period and error threshold counter