417 Expectation Failed

[Tsutomu Kaneyasu]

Hi, I have implemented the code to take a snapshot from the ONVIF camera using ONVIF Device Manger DLL.

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private static void Snapshot(string[] parameter, string imgfilename)
{
string camera_ip = "http://" + parameter[0] + "/onvif/device_service";
Uri Camuri = new Uri(camera_ip);

 System.Net.NetworkCredential account = new System.Net.NetworkCredential(parameter[1], parameter[2]);
 NvtSessionFactory sessionFactory = new NvtSessionFactory(account);
 INvtSession session = sessionFactory.CreateSession(Camuri);

 Profile[] Profiles = session.GetProfiles().RunSynchronously();

 var snapshotlink = session.GetSnapshotUri(Profiles[0].token).RunSynchronously();

 using (WebClient client = new WebClient())
 {
     client.DownloadFile(new Uri(snapshotlink.uri), imgfilename);
 }

}

DLL reference is below.

FSharp.Core.dll
onvif.discovery.dll
onvif.services.dll
onvif.session.dll
onvif.utils.dll
utils.fsharp.dll

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The following error occurs when testing ONVIF cameras that have been tested with ONVIF Device Manger.

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(417) Expectation Failed
FSharp.Core

Server stack trace:
System.Runtime.AsyncResult.EndTAsyncResult
System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
System.ServiceModel.Channels.ServiceChannelProxy.InvokeEndService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
Microsoft.FSharp.Control.AsyncBuilderImpl.commita
OnvifSnapshot.Program.Snapshot(String[] parameter, String imgfilename)

System.ServiceModel.ProtocolException: (417) Expectation Failed ---> System.Net.WebException: (417) Expectation Failed
System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelAsyncRequest.CompleteGetResponse(IAsyncResult result)

Server stack trace:
System.Runtime.AsyncResult.EndTAsyncResult
System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
System.ServiceModel.Channels.ServiceChannelProxy.InvokeEndService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
Microsoft.FSharp.Control.AsyncBuilderImpl.commita
OnvifSnapshot.Program.Snapshot(String[] parameter, String imgfilename)

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What is the cause of the error? Should I implement the following?

System.Net.ServicePointManager.Expect100Continue = false;