EHN: support for http proxies

src/caosdb/utils/server_side_scripting.py

@@ -30,7 +30,8 @@ from lxml import etree
 
 from caosdb.connection.connection import get_connection
 from caosdb.connection.utils import urlencode
-from caosdb.connection.encode import MultipartParam, multipart_encode
+from caosdb.connection.encode import (MultipartParam, multipart_encode,
+                                      ReadableMultiparts)
 
 
 def _make_params(pos_args, opts):
@@ -63,6 +64,7 @@ def _make_multipart_request(call, pos_args, opts, files):
                                               filename=filename))
 
     body, headers = multipart_encode(parts)
+    body = ReadableMultiparts(body)
     return body, headers