[ruby-core:113703] [Ruby master Feature#19697] Resolv::DNS resolution for international domains fails with "Encoding::CompatibilityError: incompatible character encodings: UTF-8 and ASCII-8BIT"

30 May 2023

      Issue #19697 has been updated by chucke (Tiago Cardoso).

byroot (Jean Boussier) wrote in #note-5:
...
...
FWIW I've touched on the potential feature request in the stdlib uri library which was not further discussed
That issue started as mentioning the removal of URI.escape, which probably prevented it from getting more attention.
I think there is potential for a feature request for IDN support in either URI or Resolv, but IMO a new clean feature request should be started, with a proposed API.
here: https://github.com/ruby/uri/issues/76

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Feature #19697: Resolv::DNS resolution for international domains fails with "Encoding::CompatibilityError: incompatible character encodings: UTF-8 and ASCII-8BIT"
https://bugs.ruby-lang.org/issues/19697#change-103349

* Author: clairity (claire c)
* Status: Open
* Priority: Normal
----------------------------------------
i try to resolve a registered international domain, and instead of receiving DNS records, get an `incompatible character encodings` error:

```
# irb
3.2.2 :001 > require 'resolv'
3.2.2 :002 > res = Resolv::DNS.open { |dns|  dns.getresource '우편.닷컴', Resolv::DNS::Resource::IN::MX  }
~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:777:in `[]=': incompatible character encodings: UTF-8 and ASCII-8BIT (Encoding::CompatibilityError)
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:777:in `sender'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:527:in `block in fetch_resource'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1125:in `block (3 levels) in resolv'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1123:in `each'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1123:in `block (2 levels) in resolv'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1122:in `each'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1122:in `block in resolv'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1120:in `each'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:1120:in `resolv'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:521:in `fetch_resource'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:507:in `each_resource'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:488:in `getresource'
  from (irb):3:in `block in <top (required)>'
  from ~/.rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/resolv.rb:298:in `open'
  from (irb):3:in `<main>'
  from ~/.rvm/gems/ruby-3.2.2/gems/irb-1.6.4/exe/irb:9:in `<top (required)>'
  ... 4 levels...
```

i also tried this command in 3.3.0-preview1 and 2.1.4, receiving the same error. the expected response is to get DNS records for `우편.닷컴` (or any registered international domain). `dig 우편.닷컴` does indeed return a short but valid DNS record.

-- 
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