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I have a Rails API hosted in Heroku. I also have a .NET console client that issues HTTPRequests (POST) to it just fine. However, I have a Silverlight that needs to do the same, but I keep getting this error:
Code 4004
ManagedRuntimeError
Which apparently is related to crossdomain issues.
Does anybody know what I need to do to get this Silverlight app to work against my Rails API?
Sounds like you need to add a crossdomain.xml and/or clientaccesspolicy.xml file to the root of your rails site. Add the domain from which you are requesting from with the silverlight app.
Here is an MSDN article:
http://msdn.microsoft.com/en-us/library/cc197955(v=vs.95).aspx
See also this answer: Cross Domain security error in Silverlight?