[MapProxy] error in WMTS GetCapabilities

[benoit.david at wms.lautre.net]

Hello,

I have an error on WMTS GetCapabilities on the default configuration.
I used the 'Embedding' solution for deployment on Ubuntu.
When I click in the demo page on "Capabilities Document (download as
xml)", I got "internal error".
The Apache error log contains:
---
[error]     assert self.supports_access_with_origin(origin), 'TODO error
exception', referer: ***
[error] AssertionError: TODO error exception, referer: ***
---

(I replaced the Referer by ***)

Does somebody know why ?

Regards

Benoit DAVID