From 30d812eea233914b3aead55b8053a9c804e594d3 Mon Sep 17 00:00:00 2001
From: Paul Tremberth <paul.tremberth@gmail.com>
Date: Fri, 3 Mar 2017 17:15:37 +0100
Subject: [PATCH] Remove redundant slot.add_request() call in ExecutionEngine

---
 scrapy/core/engine.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/scrapy/core/engine.py b/scrapy/core/engine.py
index 2b5770138..37fe0a873 100644
--- a/scrapy/core/engine.py
+++ b/scrapy/core/engine.py
@@ -218,10 +218,8 @@ class ExecutionEngine(object):
                                         request=request, spider=spider)
 
     def download(self, request, spider):
-        slot = self.slot
-        slot.add_request(request)
         d = self._download(request, spider)
-        d.addBoth(self._downloaded, slot, request, spider)
+        d.addBoth(self._downloaded, self.slot, request, spider)
         return d
 
     def _downloaded(self, response, slot, request, spider):