mergePaths example

$transformed->setPath($this->getPath());

                if ($relative->getQuery()) {
                    $transformed->setQuery($relative->getQuery());
                } else {
                    $transformed->setQuery($this->getQuery());
                }
            } else {
                if (strpos($relative->getPath(), '/') === 0) {
                    $transformed->setPath($relative->getPath());
                } else {
                    $transformed->setPath($this->mergePaths($this, $relative));
                }

                $transformed->setQuery($relative->getQuery());
            }

            $transformed->setAuthority($this->getAuthority());
        }

        $transformed->setScheme($this->getScheme());

        $transformed->setFragment($relative->getFragment());