Fix RedirectMiddleware not honouring meta handle_httpstatus keys

docs/topics/downloader-middleware.rst

@@ -724,6 +724,12 @@ responses (and pass them through to your spider) you can do this::
     class MySpider(CrawlSpider):
         handle_httpstatus_list = [301, 302]
 
+The ``handle_httpstatus_list`` key of :attr:`Request.meta
+<scrapy.http.Request.meta>` can also be used to specify which response codes to
+allow on a per-request basis. You can also set the meta key
+``handle_httpstatus_all`` to ``True`` if you want to allow any response code
+for a request.
+
 
 RedirectMiddleware settings
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~

scrapy/downloadermiddlewares/redirect.py

@@ -55,7 +55,9 @@ class RedirectMiddleware(BaseRedirectMiddleware):
 
     def process_response(self, request, response, spider):
         if (request.meta.get('dont_redirect', False) or
-               response.status in getattr(spider, 'handle_httpstatus_list', [])):
+               response.status in getattr(spider, 'handle_httpstatus_list', []) or
+               response.status in request.meta.get('handle_httpstatus_list', []) or
+               request.meta.get('handle_httpstatus_all', False)):
             return response
 
         if request.method == 'HEAD':

tests/test_downloadermiddleware_redirect.py

@@ -139,6 +139,17 @@ class RedirectMiddlewareTest(unittest.TestCase):
         r = self.mw.process_response(req, rsp, smartspider)
         self.assertIs(r, rsp)
 
+    def test_request_meta_handling(self):
+        url = 'http://www.example.com/301'
+        url2 = 'http://www.example.com/redirected'
+        def _test_passthrough(req):
+            rsp = Response(url, headers={'Location': url2}, status=301, request=req)
+            r = self.mw.process_response(req, rsp, self.spider)
+            self.assertIs(r, rsp)
+        _test_passthrough(Request(url, meta={'handle_httpstatus_list':
+                                                           [404, 301, 302]}))
+        _test_passthrough(Request(url, meta={'handle_httpstatus_all': True}))
+
 
 class MetaRefreshMiddlewareTest(unittest.TestCase):