Using the proper method to get the filename from the url.

src/zc/buildout/networkcache.py

@@ -109,7 +109,8 @@ def upload_network_cached(dir_url, cache_url, external_url, path, logger,
 
     logger.info('Uploading %s into network cache.' % external_url)
 
-    file_name = external_url.split('/')[-1].split('#')[0].split('?')[0]
+    file_name = get_filename_from_url(external_url)
+
     directory_key = get_directory_key(external_url)
     kw = dict(file=file_name,
               urlmd5=hashlib.md5(external_url).hexdigest())