diff --git a/googleapiclient/http.py b/googleapiclient/http.py
index cdc9f58..22cb80c 100644
--- a/googleapiclient/http.py
+++ b/googleapiclient/http.py
@@ -561,8 +561,6 @@
         self._total_size = int(length)
       elif 'content-length' in resp:
         self._total_size = int(resp['content-length'])
-      else:
-        raise HttpError(resp, content, uri=self._uri)
 
       if self._progress == self._total_size:
         self._done = True