Description of problem:

# The name of this file is bug.rb
require 'uri'
ENV['http_proxy']='http://127.0.0.1'
ENV['no_proxy']='192.0.2.2'
URI("http://example.org/").find_proxy
$ ruby bug.rb
/home/m/.rbenv/versions/2.4.0/lib/ruby/2.4.0/ipaddr.rb:563:in `in6_addr': invalid address (IPAddr::InvalidAddressError)
        from /home/m/.rbenv/versions/2.4.0/lib/ruby/2.4.0/ipaddr.rb:500:in `initialize'
        from /home/m/.rbenv/versions/2.4.0/lib/ruby/2.4.0/ipaddr.rb:518:in `new'
        from /home/m/.rbenv/versions/2.4.0/lib/ruby/2.4.0/ipaddr.rb:518:in `coerce_other'
        from /home/m/.rbenv/versions/2.4.0/lib/ruby/2.4.0/ipaddr.rb:174:in `include?'
        from /home/m/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:1541:in `block in find_proxy'
        from /home/m/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:1530:in `scan'
        from /home/m/.rbenv/versions/2.4.0/lib/ruby/2.4.0/uri/generic.rb:1530:in `find_proxy'
        from bug.rb:4:in `<main>'

Version-Release number of selected component (if applicable):

ruby-libs-2.4.1-79.fc26.x86_64

How reproducible:

$ http_proxy=http://127.0.0.1 no_proxy=192.0.2.2 ruby -ropen-uri -e 'open("http://example.org")'



Actual results:

see above