Intern common Train-Case header names#2266
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Extend NettyRequestFactory's known header-name table with prebuilt Train-Case AsciiString instances for the common headers already covered by lowercase Netty constants. This lets caller-supplied names such as Content-Type and Authorization take the HttpHeadersEncoder bulk-copy path while preserving on-wire casing. Odd casing and custom header names still miss the table and pass through unchanged. Update focused interning tests for Train-Case interning and odd-casing passthrough. Codex on behalf of Pavel Ptashyts Co-Authored-By: Codex <codex@openai.com>
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Summary
Rationale
NettyRequestFactory already interns known lowercase header names so HttpHeadersEncoder can bulk-copy AsciiString bytes on the event loop. Real request code often supplies names such as Content-Type and Authorization in Train-Case, which previously missed the table and fell back to per-character encoding. Adding same-spelling AsciiString entries preserves wire casing while putting those common names on the same fast path.
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Attribution
Codex on behalf of Pavel Ptashyts