OWIN request BodyDelegate in Environment Dictionary vs. passed to App Delegate

gistfile1.txt

// body-in-env

void AppDelegate(IDictionary<string, object> env, Action<string, IDictionary<string, string>, BodyDelegate> result, Action<Error> error) {
    var requestBody = (BodyDelegate)env["owin.RequestBody"];
    ...
}


// body-as-arg

void AppDelegate(IDictionary<string, object> env, BodyDelegate requestBody, Action<string, IDictionary<string, string>, BodyDelegate> result, Action<Error> error) {
    // (requestBody given as an argument)
    // ...
}