protected function post($command, $params = null, $postcontenttype = 'application/json')
    {
        return $this->transport->post($command, $params, $postcontenttype);
    }
protected function post($command, $params = null, $postcontenttype = 'application/json')
    {
        return $this->transport->post($command, $params, $postcontenttype);
    }
protected function post ( $ command , $ params = null , $ postcontenttype = 'application/json' ) { return $ this -> transport -> post ( $ command , $ params , $ postcontenttype ) ; }
Post a command to the API.

@param string        $command         The command to post.

@param null|string[] $params          The parameters (if any).

@param string        $postcontenttype The content type.

@return EntityBodyInterface|null|string
Post a command to the API .