At the moment to embed reports in a intranet webpage we only have the option to put ?rs:Embed=True at the end of the url. I have read (on this website) that there are plans to extend this so paramet...
This is the the one of the main lacks from the on-premise solution, expecially in the developer point of view. An api complied with the power.com api as someone commented before could be a good step forword.
