Fix potential bugs without expected behavior change

- Fix uninitialized variables
- Fix potentially not set variables
- Fix wrong parameter default value
- Fix method scope
- Fix missing return value

src/Util/Network.php

@@ -101,6 +101,7 @@ class Network
 			return CurlResult::createErrorCurl(substr($url, 0, 200));
 		}
 
+		$parts2 = [];
 		$parts = parse_url($url);
 		$path_parts = explode('/', defaults($parts, 'path', ''));
 		foreach ($path_parts as $part) {