private static AsciiString create(String name) {
        final AsciiString cached = AsciiString.cached(Ascii.toLowerCase(name));
        assert inverseMapBuilder != null;
        inverseMapBuilder.put(cached, name);
        return cached;
    }
The HTTP <a href="https://datatracker.ietf.org/doc/html/rfc7838#page-8">{@code Alt-Svc}</a>
header field name.
core/src/main/java/com/linecorp/armeria/common/HttpHeaderNames.java