优化taskExists方法

添加`post`参数请求支持

py/download.py

@@ -0,0 +1,21 @@
+# coding=utf-8
+
+import os
+from flask import Flask, send_from_directory, request
+
+app = Flask(__name__)
+
+
+@app.route("/download/<path:filename>", methods=['POST', 'GET'])
+def downloader(filename):
+    """
+    不支持断点的下载
+    """
+    data = request.values.get('key')
+    print data
+    dirpath = 'D:/test'
+    return send_from_directory(dirpath, filename, as_attachment=True)  # as_attachment=True 一定要写，不然会变成打开，而不是下载
+
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', debug=True)  # 需要关闭防火墙