fix(#19): Avoid read http header when response 3/4/5xx

Change ResponseInterface::getHeaders() #1 parameter to TRUE, then an exception should be thrown on 3/4/5xx status codes

Signed-off-by: RazeSoldier <[email protected]>

Author: RazeSoldier

includes/DownloadTask.php

@@ -53,7 +53,7 @@ public function __construct(string $url, string $savePath) {
 	 */
 	public function download() {
 		$resp = $this->makeNormalRequest();
-		$expectedSize = $resp->getHeaders(false)['content-length'][0];
+		$expectedSize = $resp->getHeaders(true)['content-length'][0];
 		$file = fopen($this->savePath, 'w+b');
 
 		$this->doTransport($resp, $file);