retry streamlink

stream.py

@@ -327,12 +327,15 @@ class MainHandler(tornado.web.RequestHandler):
 
     async def handle_stream(self, handler, redir):
         upstream = None
-        try:
-            logger.info(handler.proxy)
-            streams = handler.proxy.stream().streams(handler.upstream)
-        except Exception as e:
-            logger.info(e)
-        else:
+        streams = None
+        for i in range(5):
+            try:
+                streams = handler.proxy.stream().streams(handler.upstream)
+            except Exception as e:
+                logger.info(e)
+            else:
+                break
+        if streams is not None:
             for key in reversed(streams):
                 stream = streams.get(key)
                 if hasattr(stream, "url"):