v1Client.update_image fails when image attribute value is not string

By running:

            (glance_client, image_id) = self._glance.get_glance_client(context, name)
            image_metadata = {"is_public": False,
                      "disk_format": "vhd",
                      "container_format": "bare",
                      "properties": {}}
            f = open(image_vhd_path, 'rb')
            LOG.debug(_("Updating Glance image %s with content from merged disk %s"), image_id, image_vhd_path)
            glance_client.update_image(image_id, image_meta=image_metadata, image_data=f)

I get the following exception:

TypeError: sequence item 0: expected string, long found

File:

..\Python27\lib\site-packages\glance\common\client.py

Line:

542

The issue can be solved by changing at line 542:

c.putheader(header, value)

with

c.putheader(header, str(value))