public static ChannelConfig defaultChannelConfig(String listenAddressName) {
        ChannelConfig config = new ChannelConfig();

        config.add(new ChannelConfigValue<>(
                CommonChannelConfigKeys.maxConnections,
                chooseIntChannelProperty(
                        listenAddressName, "connection.max", CommonChannelConfigKeys.maxConnections.defaultValue())));
        config.add(new ChannelConfigValue<>(
                CommonChannelConfigKeys.maxRequestsPerConnection,
                chooseIntChannelProperty(listenAddressName, "connection.max.requests", 20000)));
        config.add(new ChannelConfigValue<>(
                CommonChannelConfigKeys.maxRequestsPerConnectionInBrownout,
                chooseIntChannelProperty(
                        listenAddressName,
                        "connection.max.requests.brownout",
                        CommonChannelConfigKeys.maxRequestsPerConnectionInBrownout.defaultValue())));
        config.add(new ChannelConfigValue<>(
                CommonChannelConfigKeys.connectionExpiry,
                chooseIntChannelProperty(
                        listenAddressName,
                        "connection.expiry",
                        CommonChannelConfigKeys.connectionExpiry.defaultValue())));
        config.add(new ChannelConfigValue<>(
                CommonChannelConfigKeys.httpRequestReadTimeout,
                chooseIntChannelProperty(
                        listenAddressName,
                        "http.request.read.timeout",
                        CommonChannelConfigKeys.httpRequestReadTimeout.defaultValue())));

        int connectionIdleTimeout = chooseIntChannelProperty(
                listenAddressName, "connection.idle.timeout", CommonChannelConfigKeys.idleTimeout.defaultValue());
        config.add(new ChannelConfigValue<>(CommonChannelConfigKeys.idleTimeout, connectionIdleTimeout));
        config.add(new ChannelConfigValue<>(
                CommonChannelConfigKeys.serverTimeout, new ServerTimeout(connectionIdleTimeout)));

        // For security, default to NEVER allowing XFF/Proxy headers from client.
        config.add(new ChannelConfigValue<>(
                CommonChannelConfigKeys.allowProxyHeadersWhen, StripUntrustedProxyHeadersHandler.AllowWhen.NEVER));

        config.set(CommonChannelConfigKeys.withProxyProtocol, true);
        config.set(CommonChannelConfigKeys.preferProxyProtocolForClientIp, true);

        config.add(new ChannelConfigValue<>(
                CommonChannelConfigKeys.connCloseDelay,
                chooseIntChannelProperty(
                        listenAddressName,
                        "connection.close.delay",
                        CommonChannelConfigKeys.connCloseDelay.defaultValue())));

        return config;
    }
First looks for a property specific to the named listen address of the form -
"server.${addrName}.${propertySuffix}". If none found, then looks for a server-wide property of the form -
"server.${propertySuffix}".  If that is also not found, then returns the specified default value.
zuul-core/src/main/java/com/netflix/zuul/netty/server/BaseServerStartup.java