What part of Framework 4.5 is exactly available on MS CRM Online

Hi,

Writing a plugin for CRM Online, I discovered after deployment that I get an error when loading the reference assemblies of my plugin:

'System.Net.Http.Formatting, Version=4.0.0.0'  not loaded

So it mean that we can't use the HttpClient and PostAsJsonAsync or PuttAsJsonAsync ?

But they are Framework 4.5 system assemblies and are already availables under Azure ?

Is there a planned date for their availability ?

Thanks