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Recursive DNS lookup with Dnsruby::Recursor #141

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@TooManyBees TooManyBees commented Jan 18, 2022

GitHubPages::HealthCheck::Resolver does a recursive DNS lookup by wrapping Dnsruby::Resolver in a Dnsruby::Recursor. No change to its API.

addresses https://github.com/github/pages-engineering/issues/912

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This PR increases the time that it takes to run the test suite. May want to consider mocking web requests.

In spec/github_pages_health_check/resolver_spec.rb, the test "uses an authoritative resolver" usually fails by raising Dnsruby::ResolvError::Refused when run in isolation. The test passes when run with other tests (so, when not run first). Keep this as a draft PR until we can figure that out.

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