diff --git a/tc-copy b/tc-copy
index a1a293e57..543f73da8 100755
--- a/tc-copy
+++ b/tc-copy
@@ -78,7 +78,7 @@ def main(argv):
             else:
                 tilestream = input_tilestore.list()
             if options.i is not None and options.n is not None:
-                tilestream = imap(EveryNth(options.n, options.i), tilestream)
+                tilestream = map(EveryNth(options.n, options.i), tilestream)
             if options.randomize:
                 tilestream = list(tilestream)
                 random.shuffle(tilestream)
@@ -90,7 +90,7 @@ def main(argv):
                 tilestream = map(benchmark.sample(), tilestream)
             tilestream = input_tilestore.get(tilestream)
             if benchmark:
-                tilestream = imap(benchmark.sample("get"), tilestream)
+                tilestream = map(benchmark.sample("get"), tilestream)
             for i, g in enumerate(generate):
                 tilestream = g.get(tilestream)
                 if options.benchmark:
diff --git a/tilecloud/store/url.py b/tilecloud/store/url.py
index b977c8d7d..3491aa827 100644
--- a/tilecloud/store/url.py
+++ b/tilecloud/store/url.py
@@ -35,10 +35,13 @@ def get_one(self, tile):
             tile.content_type = response.headers.get("Content-Type")
             if response.status_code < 300:
                 tile.data = response.content
-                if tile.content_type.startswith("image/"):
-                    tile.data = response.content
-                else:
-                    tile.error = response.text
+                if tile.content_type:
+                    if tile.content_type.startswith("image/"):
+                        tile.data = response.content
+                    else:
+                        tile.error = response.text
+                elif response.status_code != 200:
+                    tile.error = "Unable to read content type {0}".format(title.content_type)
             else:
                 tile.error = response.reason
         except requests.exceptions.RequestException as e: