IPv4 addresses in URLs are wrappen into brackets in debug log lines

[grobie]

Host operating system: output of uname -a

Linux some.node 4.4.10+soundcloud #1 SMP Thu Jun 16 15:17:20 UTC 2016 x86_64 GNU/Linux

blackbox_exporter version: output of blackbox_exporter -version

blackbox_exporter, version 0.10.0 (branch: HEAD, revision: 75681e3c4f051e24269a132e8ec19517118e1586)
  build user:       root@0334aae810a6
  build date:       20171009-14:25:49
  go version:       go1.9.1

What did you do that produced an error?

Run exporter with --log.level=debug

What did you expect to see?

URLs with IPv4 addresses are correctly formatted.

What did you see instead?

URLs with IPv4 addresses include brackets around them, which are only valid for IPv6 addresses.