src/Protocol/Http/Visitor/HttpProtocolChainVisitor.php
public function add(HttpProtocolVisitorInterface $visitor, int $priority = 0): void
    {
        $this->visitors->insert($visitor, $priority);
    }
public function add(HttpProtocolVisitorInterface $visitor, int $priority = 0): void
    {
        $this->visitors->insert($visitor, $priority);
    }
Add visitor to chain

@param HttpProtocolVisitorInterface $visitor
@param int                          $priority