SelectorFailureBehavior Type — netty Architecture

Source Code

handler/src/main/java/io/netty/handler/ssl/ApplicationProtocolConfig.java lines 107–131

    public enum SelectorFailureBehavior {
        /**
         * If the peer who selects the application protocol doesn't find a match this will result in the failing the
         * handshake with a fatal alert.
         * <p>
         * For example in the case of ALPN this will result in a
         * <a herf="https://tools.ietf.org/html/rfc7301#section-3.2">no_application_protocol(120)</a> alert.
         */
        FATAL_ALERT,
        /**
         * If the peer who selects the application protocol doesn't find a match it will pretend no to support
         * the TLS extension by not advertising support for the TLS extension in the handshake. This is used in cases
         * where a "best effort" is desired to talk even if there is no matching protocol.
         */
        NO_ADVERTISE,
        /**
         * If the peer who selects the application protocol doesn't find a match it will just select the last protocol
         * it advertised support for. This is used in cases where a "best effort" is desired to talk even if there
         * is no matching protocol, and the assumption is the "most general" fallback protocol is typically listed last.
         * <p>
         * This may be <a href="https://tools.ietf.org/html/rfc7301#section-3.2">illegal for some RFCs</a> but was
         * observed behavior by some SSL implementations, and is supported for flexibility/compatibility.
         */
        CHOOSE_MY_LAST_PROTOCOL
    }