@Nullable
    @Override
    public final RoutingResultBuilder apply(RoutingContext routingCtx) {
        ensureAbsolutePath(requireNonNull(routingCtx, "routingCtx").path(), "path");
        return doApply(routingCtx);
    }
{@inheritDoc} This method performs sanity checks on the specified {@code path} and calls
{@link #doApply(RoutingContext)}.
core/src/main/java/com/linecorp/armeria/server/AbstractPathMapping.java