@Nullable
    @Override
    public final <V> V ownAttr(AttributeKey<V> key) {
        requireNonNull(key, "key");
        return attrs.ownAttr(key);
    }
Returns the {@link Channel} that is handling this request, or {@code null} if the connection is not
established yet.
core/src/main/java/com/linecorp/armeria/internal/common/NonWrappingRequestContext.java