SOAP Onvif no response for WCF Client - wcf

Question

I have camera that supports Onvif. Calling OnVif SOAP GetDeviceInformation
<s:Envelope
xmlns:s="http://www.w3.org/2003/05/soap-envelope">
<s:Body
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<GetDeviceInformation
xmlns="http://www.onvif.org/ver10/device/wsdl"/>
</s:Body>
</s:Envelope>
I get an answer when using SoapUI. I created simple WCF console app to call the same method - no answer from camera.
I checked with wireshart the messages sent:
SoapUI:
Frame 8858: 680 bytes on wire (5440 bits), 680 bytes captured (5440 bits) on interface 0
Ethernet II, Src: IntelCor_fc:da:96 (b4:b6:76:fc:da:96), Dst: Shenzhen_a4:9f:e8 (e8:ab:fa:a4:9f:e8)
Internet Protocol Version 4, Src: 10.0.0.8, Dst: 10.0.0.102
Transmission Control Protocol, Src Port: 61385, Dst Port: 888, Seq: 1, Ack: 1, Len: 626
Hypertext Transfer Protocol
POST /onvif/device_service HTTP/1.1\r\n
Accept-Encoding: gzip,deflate\r\n
Content-Type: application/soap+xml;charset=UTF-8;action="http://www.onvif.org/ver10/device/wsdl/GetDeviceInformation"\r\n
Content-Length: 322\r\n
[Content length: 322]
Host: 10.0.0.102:888\r\n
Connection: Keep-Alive\r\n
User-Agent: Apache-HttpClient/4.1.1 (java 1.5)\r\n
\r\n
[Full request URI: http://10.0.0.102:888/onvif/device_service]
[HTTP request 1/1]
[Response in frame: 8891]
File Data: 322 bytes
eXtensible Markup Language
<s:Envelope
xmlns:s="http://www.w3.org/2003/05/soap-envelope">
<s:Body
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<GetDeviceInformation
xmlns="http://www.onvif.org/ver10/device/wsdl"/>
</s:Body>
</s:Envelope>
WCF Client:
Frame 11631: 315 bytes on wire (2520 bits), 315 bytes captured (2520 bits) on interface 0
Ethernet II, Src: IntelCor_fc:da:96 (b4:b6:76:fc:da:96), Dst: Shenzhen_a4:9f:e8 (e8:ab:fa:a4:9f:e8)
Internet Protocol Version 4, Src: 10.0.0.8, Dst: 10.0.0.102
Transmission Control Protocol, Src Port: 61420, Dst Port: 888, Seq: 282, Ack: 1, Len: 261
[2 Reassembled TCP Segments (542 bytes): #11629(281), #11631(261)]
Hypertext Transfer Protocol
POST /onvif/device_service HTTP/1.1\r\n
Content-Type: application/soap+xml; charset=utf-8; action="http://www.onvif.org/ver10/device/wsdl/GetDeviceInformation"\r\n
Host: 10.0.0.102:888\r\n
Content-Length: 261\r\n
[Content length: 261]
Expect: 100-continue\r\n
Accept-Encoding: gzip, deflate\r\n
Connection: Keep-Alive\r\n
\r\n
[Full request URI: http://10.0.0.102:888/onvif/device_service]
[HTTP request 1/1]
File Data: 261 bytes
eXtensible Markup Language
<s:Envelope
xmlns:s="http://www.w3.org/2003/05/soap-envelope">
<s:Body
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<GetDeviceInformation
xmlns="http://www.onvif.org/ver10/device/wsdl"/>
</s:Body>
</s:Envelope>
Bellow WCF code after WSDL Onvif WSDL reference was added to project:
namespace OnVifInfo
{
class Program
{
static void Main(string[] args)
{
GetDeviceInfo(new Uri("http://10.0.0.102:888/onvif/device_service"));
}
private static void GetDeviceInfo(Uri uri)
{
string address = uri.AbsoluteUri.ToString();
var messageElement = new TextMessageEncodingBindingElement()
{
MessageVersion = MessageVersion.CreateVersion(EnvelopeVersion.Soap12, AddressingVersion.None)
};
HttpTransportBindingElement httpBinding = new HttpTransportBindingElement()
{
AuthenticationScheme = System.Net.AuthenticationSchemes.Negotiate
};
CustomBinding binding = new CustomBinding(messageElement, httpBinding);
OnVifWebService.DeviceClient service = new OnVifWebService.DeviceClient(binding, new EndpointAddress(address));
string model;
string firmwareVersion;
string serialNumber;
string hardwareId;
var response = service.GetDeviceInformation(out model, out firmwareVersion, out serialNumber, out hardwareId);
}
}
}
Any ideas why camera is not answering to WCF client?
Why there is reassemble line:
[2 Reassembled TCP Segments (542 bytes): #11629(281), #11631(261)]
in WCF client request, but not in SoapUI call

Answer 1

Problem was the Expect HTML header
Expect: 100-continue\r\n
When I added this to WCF code
System.Net.ServicePoint servicePoint = System.Net.ServicePointManager.FindServicePoint(service.Endpoint.Address.Uri);
servicePoint.Expect100Continue = false;
It removed the Expect header and I got the answer from the camera.