diff --git a/speedtest.py b/speedtest.py
index 92a2be0..425f18c 100755
--- a/speedtest.py
+++ b/speedtest.py
@@ -817,6 +817,8 @@ class HTTPDownloader(threading.Thread):
                 f.close()
         except IOError:
             pass
+        except HTTP_ERRORS:
+            pass
 
 
 class HTTPUploaderData(object):
@@ -882,7 +884,7 @@ class HTTPUploader(threading.Thread):
         self.request = request
         self.request.data.start = self.starttime = start
         self.size = size
-        self.result = None
+        self.result = 0
         self.timeout = timeout
         self.i = i
 
@@ -917,6 +919,8 @@ class HTTPUploader(threading.Thread):
                 self.result = 0
         except (IOError, SpeedtestUploadTimeout):
             self.result = sum(self.request.data.total)
+        except HTTP_ERRORS:
+            self.result = 0
 
 
 class SpeedtestResults(object):