[jonathan-kosgei]

Summary

Follow-up to #7, fixing the items it listed under "Noticed, not changed", plus the release workflow trigger: a push to main used to run the RubyGems publish job, so the merge of #7 attempted to publish 0.1.5 again and failed with "Repushing of gem versions is not allowed" (https://github.com/ipdata/ruby/actions/runs/41635184527). Eight commits, one per theme. No version change; lib/ipdata/version.rb is untouched.

Changes

• lookup(select_field: "city") without an IP requests /city instead of //city: request paths are now built from the non-nil segments.
• A base_url: with a path prefix (for example https://example.com/ipdata) keeps the prefix in front of every request path (/ipdata/8.8.8.8, /ipdata/8.8.8.8/city, /ipdata/bulk, and /ipdata/ for the caller's own IP); a trailing slash on the base URL is tolerated. Previously build_uri replaced the whole path and the prefix was lost.
• The User-Agent header is ipdata-ruby/<version> Ruby/<ruby-version> (<platform>) instead of ruby-ipdata/..., the ipdata-<language>/<version> form the Python client also uses.
• Release workflow: the push trigger is limited to v* tags (branches: [main] removed), so a merge to main no longer attempts a publish. The workflow_dispatch path (bump, commit, tag, publish) is unchanged.
• CI workflow: the Ruby magic comment (# frozen_string_literal: true) at the top of ci.yml is removed; the matrix also runs Ruby 3.4 and 4.0 with fail-fast: false, so one version's failure no longer cancels the other jobs; actions/checkout moves from v4 (a Node 20 action, deprecated on the runners) to v5 (Node 24) in both workflows.
• Test suite on Ruby 4.0: the suite stubbed Net::HTTP.new and Process.pid with Object#stub from minitest/mock, which it never required (Minitest 5's minitest/autorun loaded it implicitly). Minitest 6, which Ruby 4.0 bundles, no longer ships minitest/mock, so every stubbing test failed there with NoMethodError. A small with_stub helper in test/test_helper.rb replaces the singleton method for the duration of a block and restores it; the suite now runs under Minitest 5 and 6 without additional gems.
• Gem metadata: homepage is now https://ipdata.co while source_code_uri stays at this repository, so gem build no longer warns that both keys hold the same URL; CHANGELOG.md now exists (the target of changelog_uri), lists everything since 0.1.5 under "Unreleased" in the format of the PHP client's changelog, and is packaged with the gem. The stdlib comment in the gemspec also names openssl.
• test/test_client.rb: the unused local uri in assert_request is removed; ruby -w is clean for the library and the suite.

Not changed

• README "Development" still says bundle exec rake test: the Rakefile defines that task and it works in a normal setup; CI's ruby -Ilib -Itest -e ... one-liner runs the same suite without Bundler.
• CHANGELOG.md groups the connection-reuse and new-field changes from Reuse HTTPS connections, add new response fields #7 together with the changes here under "Unreleased", because nothing has been tagged since 0.1.5; move them under the version heading when that release is cut.

Verification

Ruby 3.3.6, run after each commit and again before each push:

• ruby -Ilib -Itest -e "Dir['test/test_*.rb'].each { |f| require File.expand_path(f) }": 118 runs, 424 assertions, 0 failures, 0 errors, 0 skips (main: 115 runs, 400 assertions). Three tests added: single-field lookup without an IP, a prefixed base URL for lookup, select_field and bulk_lookup, and a trailing slash on the base URL.
• The same one-liner with Minitest 6.0.6 on the load path: 118 runs, 424 assertions, 0 failures, 0 errors. Before the with_stub change it reported 42 errors (undefined method 'stub' for class Net::HTTP), the same failure the first CI run showed on Ruby 4.0.
• ruby -w -Ilib -Itest -e "Dir['test/test_*.rb'].each { |f| require File.expand_path(f) }": no warnings with Minitest 5.26.2 or 6.0.6 (main reported the unused uri).
• gem build ipdata.gemspec: "Successfully built RubyGem" with no metadata warning (main warned about identical homepage_uri/source_code_uri); the packaged file list includes CHANGELOG.md.
• CI: run 15 (first push, https://github.com/ipdata/ruby/actions/runs/41639414385) passed tests and gem build on Ruby 3.0 to 3.4 and failed only on Ruby 4.0 for the Minitest 6 reason above; fail-fast then cancelled the passing jobs. Run 16 on the current head b037c14 (https://github.com/ipdata/ruby/actions/runs/41640391401): success, all six matrix jobs (Ruby 3.0, 3.1, 3.2, 3.3, 3.4, 4.0) passed the tests and gem build.

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