Issue #20686 has been updated by jhawthorn (John Hawthorn). jeremyevans0 (Jeremy Evans) wrote in #note-1:
It appears RFC 3986 allows empty hosts (https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2: `reg-name = *( unreserved / pct-encoded / sub-delims )`), so I think this is not a bug, but an expected behavior change.
It's allowed by the ABNF, but the next paragraph states that it isn't valid for HTTP/HTTPS URIs
If the URI scheme defines a default for host, then that default applies when the host subcomponent is undefined or when the registered name is empty (zero length). For example, the "file" URI scheme is defined so that no authority, an empty host, and "localhost" all mean the end-user's machine, **whereas the "http"** **scheme considers a missing authority or empty host invalid.**
---------------------------------------- Bug #20686: URI::HTTPS can build URI with blank, invalid host https://bugs.ruby-lang.org/issues/20686#change-109468 * Author: ronricardo (Roniece Ricardo) * Status: Open * ruby -v: 3.4.0+ * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- In Ruby 3.4.0+, calling `URI::HTTPS.build(host: "")` does not raise `URI::InvalidComponentError` as expected. Instead, it returns `#<URI::HTTPS https://>` I think this was introduced in [this PR](https://github.com/ruby/uri/pull/90). ## Steps to Reproduce ### 1. Environment: - **Ruby Version:** 3.4.0+ ### 2. Steps: - Open an IRB session. - Run: ```ruby URI::HTTPS.build(host: "") ``` ### 3. Expected Behavior: - `URI::InvalidComponentError` should be raised due to the invalid empty `host` component. ### 4. Actual Behavior: - Returns `#<URI::HTTPS https://>` without raising an error. ### Ruby 3.1.4: ```ruby irb(main):008:0> RUBY_VERSION => "3.1.4" irb(main):009:0> URI::HTTPS.build(host:"") /home/vscode/.rbenv/versions/3.1.4/lib/ruby/3.1.0/uri/generic.rb:601:in `check_host': bad component(expected host component): (URI::InvalidComponentError) ``` ### Ruby 3.4.0: ```ruby irb(…):015> RUBY_VERSION => "3.4.0" irb(...):016> URI::HTTPS.build(host:"") => #<URI::HTTPS https://> ``` -- https://bugs.ruby-lang.org/