feat: 实现下载检查功能

scripts/autoload/DownloadManager.gd

@@ -7,11 +7,16 @@ func download_file(server_path: String, local_path: String) -> void:
 
 func download_from_origin() -> int:
     var origin = GameManager.data_origin
+    var http = HTTPRequest.new()
 
     if origin.substr(0, 4) != "http":
         return 1
     
+    if http.request(origin) != OK:
+        return 2
 
+    if origin[-1] != "/":
+        origin = origin + "/"
 
     return 0
 

scripts/settings/settings.gd

@@ -21,6 +21,10 @@ func _on_download_button_pressed() -> void:
 	var result: int = DownloadManager.download_from_origin()
 	if result == 1:
 		$Tips.text = "提示：下载失败。数据源路径错误"
+		return
+	elif result == 2:
+		$Tips.text = "提示：下载失败。创建请求失败"
+		return
 	$Tips.text = "提示：正在加载资源，请勿关闭设置页面"
 	DownloadManager.load_resource()
 	$Tips.text = "提示：完成加载"