From 15ccf79cad46385041fb8c3a7bf697d9d7ee7c55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Gra=C3=B1a?= <dangra@gmail.com>
Date: Mon, 10 Aug 2015 18:18:13 -0300
Subject: [PATCH] Log errors importing or initializing download handlers

---
 scrapy/core/downloader/handlers/__init__.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/scrapy/core/downloader/handlers/__init__.py b/scrapy/core/downloader/handlers/__init__.py
index 062f674b2..65e5bc21f 100644
--- a/scrapy/core/downloader/handlers/__init__.py
+++ b/scrapy/core/downloader/handlers/__init__.py
@@ -43,14 +43,16 @@ class DownloadHandlers(object):
                     'no handler available for that scheme'
             return None
 
+        path = self._schemes[scheme]
         try:
-            dhcls = load_object(self._schemes[scheme])
+            dhcls = load_object(path)
             dh = dhcls(self._crawler_settings)
         except NotConfigured as ex:
             self._notconfigured[scheme] = str(ex)
             return None
         except Exception as ex:
-            logger.exception()
+            logger.exception('Loading "{}" for scheme "{}" handler'\
+                             .format(path, scheme))
             self._notconfigured[scheme] = str(ex)
             return None
         else: