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Error writing headers when returning FileInfo HttpResult

I am on Mono 3.x, on Mac OSX, and I am trying to return a static file with ServiceStack. The code (and should be, according to other answers) is very simple:

public class AirPlayService : Service
{
    public object Get(Movie request)
    {
        var fileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "Movies", request.Name);

        var file = new FileInfo(fileName);
        return new HttpResult(file, asAttachment:false); 
    }
}

The Movie object is a simple DTO.
When my Get () is called, I see the following error in the terminal window:

ERROR: Error processing request: [IOException] Write error, exception: write failed INFO: Failed to write error for response: {0}, Exception: cannot be changed after sending headers. ERROR: Error in HttpListenerResponseWrapper: write failed, exception: write failed

ServiceStack - version 3.9.35; Mono JIT compiler version 3.0.3 (master / 39c48d5 Tue 8 Jan 12:12:24 EST 2013) ;. NET 4.5.

What am I doing wrong?

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1

-, , :

public class AirPlayService : Service
{
    public object Get(Movie request)
    {
        var fileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ( "Movies", request.Name);

        var file = new FileInfo(fileName);
        return new HttpResult(file, asAttachment:false);
+1

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