we need to retry when we get BadStatusLine

this is caused by the http keep alive being closed by the server

aqt/sync.py

@@ -448,7 +448,9 @@ httplib.HTTPConnection.send = _incrementalSend
 # this is an augmented version of httplib's request routine that:
 # - doesn't assume requests will be tried more than once
 # - calls a hook for each chunk of data so we can update the gui
+# - retries only when keep-alive connection is closed
 def _conn_request(self, conn, request_uri, method, body, headers):
+    for i in range(2):
         try:
             if conn.sock is None:
               conn.connect()
@@ -470,6 +472,11 @@ def _conn_request(self, conn, request_uri, method, body, headers):
             raise
         try:
             response = conn.getresponse()
+        except httplib.BadStatusLine:
+            print "retry bad line"
+            conn.close()
+            conn.connect()
+            continue
         except (socket.error, httplib.HTTPException):
             raise
         else: