HeaderMap was split into the HeaderView interface and Http1HeaderMap impl in the HTTP/2 model refactor, but two extension-module tests (flash-ext-jackson, flash-ext-view-jte) still referenced the old class name, breaking the CI build on master after the HTTP/2 PR merge. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JCmqb7XGb3JQvCWf589yma