Hello Emmanuel, not sure if there was an acknowledgment from your side of an issue with making your ServerUserPreferences library work behind a proxy. My last assessment was that, when working behind a proxy, if you pass to ServerUserPreferences constructor:

1. absolute URLs: the ServerUserPreferences code fails because it cannot reach the library
2. relative URLs: the code fails because it expects absolute URLs
3. local absolute URLs: ServerUserPreferences works, but the Javascript in the client cannot reach the resources
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   In my opinion it should be up to the JavaScript library to calculate the URL based on relative positioning of the resources.
   
   Do you acknowledge the problem ?
   Have you done any modification for v7.3 ? Not seen any reference about this problem in the release notes.