Exceptions need to be instances.

src/Network/Http/Response.php

@@ -143,7 +143,7 @@ public function __construct($headers = [], $body = '') {
  */
 	protected function _decodeGzipBody($body) {
 		if (!function_exists('gzinflate')) {
-			throw \RuntimeException('Cannot decompress gzip response body without gzipinflate()');
+			throw new \RuntimeException('Cannot decompress gzip response body without gzipinflate()');
 		}
 		$offset = 0;
 		// Look for gzip 'signature'