From 25241f2cc0f23687edc6cbda0020c9d1b628da9f Mon Sep 17 00:00:00 2001
From: immerrr <immerrr@gmail.com>
Date: Mon, 30 Oct 2017 20:57:33 +0100
Subject: [PATCH] CookiesMiddleware: add "cookies_reset" meta to clear the jar

---
 scrapy/downloadermiddlewares/cookies.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scrapy/downloadermiddlewares/cookies.py b/scrapy/downloadermiddlewares/cookies.py
index 321c0171b..52cc0de7a 100644
--- a/scrapy/downloadermiddlewares/cookies.py
+++ b/scrapy/downloadermiddlewares/cookies.py
@@ -30,6 +30,10 @@ class CookiesMiddleware(object):
 
         cookiejarkey = request.meta.get("cookiejar")
         jar = self.jars[cookiejarkey]
+
+        if request.meta.get('cookies_reset', False):
+            jar.clear()
+
         cookies = self._get_request_cookies(jar, request)
         for cookie in cookies:
             jar.set_cookie_if_ok(cookie, request)