JSON Dict format Issue

[loksurya]

I have a url format "rtmp://hub/endPoint1/stream_id
How do I define JSONDict for it ?
I have used
NSDictionary *streamJson = @ { @"publishSecurity": @"static",
@"hub": @"oflaDemo",
@"title": @"loksurya",
@"publishKey": @"",
@"disabled ": @ (YES),
@"hosts":@ { @"publish": @{
@"rtmp": @"my_hub"
}
},
};
but it is saying "URL is not authenticated".
Can anyone explain what is wrong with my URL?