public Class<? extends DomainSocketChannel> domainSocketChannelType() {
        return provider.domainSocketChannelType();
    }
Returns the {@link DomainSocketChannel} class that is available for this transport type.

@throws IllegalStateException if this {@link TransportType} is not currently available.
core/src/main/java/com/linecorp/armeria/common/util/TransportType.java