proxy.html masters with file:// protocol

[sportmann]

We try to register masters within the proxy.html to allow to communicate within a local opened html file (file:///C:/temp/ZKF_2033054588-3.html) corresponding with our https server. But the request gets blocked. It only works if we add the master: '':''

Is it possible to register 'file:///' masters?

`

<script src="xdomain.min.js"></script> <script> xdomain.masters({ 'https://*.jaxforms.com': '*', 'http://localhost':'*', 'file:///':'*' }); xdomain.debug = true; </script>`

[sportmann]

Looks like if file is loading from local harddisk (file:///...) the origin is "null" and will be put to a "*". See screenshot. How han i recognize the html is loaded from a file?