public long http2MaxHeaderListSize() {
        return get(HTTP2_MAX_HEADER_LIST_SIZE);
    }
Returns the HTTP/2 <a href="https://datatracker.ietf.org/doc/html/rfc7540#section-6.5.2">
SETTINGS_MAX_HEADER_LIST_SIZE</a> that indicates the maximum size of header list
that the client is prepared to accept, in octets.
core/src/main/java/com/linecorp/armeria/client/ClientFactoryOptions.java