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* feat: drop headers with underscore in their names * feat: Caddyfile binding and tests for underscore-in-header drop Add the `allow_underscore_in_headers` global server option, refine the doc comment, and cover the filter end-to-end: server-level unit tests (drop, opt-out, debug log, RFC-7230 space rejection), a fastcgi unit test for the trimmed header name replacer, and forward_auth integration tests for both the default-drop and opt-out paths. * remove allow_underscore_in_headers option for now