src/Server.php
public function append($middleware, $priority = 0): Server
    {
        return $this->appendOnCondition(
            $middleware,
            $this->buildAlwaysTrue(),
            $priority
        );
    }
public function append($middleware, $priority = 0): Server
    {
        return $this->appendOnCondition(
            $middleware,
            $this->buildAlwaysTrue(),
            $priority
        );
    }
public function append ( $ middleware , $ priority = 0 ) : Server { return $ this -> appendOnCondition ( $ middleware , $ this -> buildAlwaysTrue ( ) , $ priority ) ; }
Always adds a middleware to the stack.

The middleware will run in any case.

@param MiddlewareInterface|callable|array $middleware
@param int                                $priority
@return Server
Always adds a middleware to the stack .