SoapHttpClientProtocol ReadResponse is failing with root element missing

Question

User591890860 posted

I am using a 3rd party web service. I have added a service reference to a window application project. When I call any function of the web service I get the follwoing error,

System.InvalidOperationException: Response is not well-formed XML. ---> System.Xml.XmlException: Root element is missing.\r\n   at System.Xml.XmlTextReaderImpl.Throw(Exception e)\r\n   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()\r\n   at System.Xml.XmlTextReaderImpl.Read()\r\n   at System.Xml.XmlTextReader.Read()\r\n   at System.Xml.XmlReader.MoveToContent()\r\n   at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)\r\n   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)

The same service can be accessed from a web browser without any error.

Can anyone please help?

Answer 1

User220959680 posted

Response is not well-formed XML.

Check the web service method name being consumed is correct or mis-spelled.

Copy the client source that invokes the service for further help.

Answer 2

User260886948 posted

Hi,

As you said that the same service can be accessed from a web browser without any error, it seems that it's a permission related issue in C:/Windows/Temp folder .

And if you still can not solve your problem, please try to download Fiddler and use this tool to check the response text.  

#Fiddler:
http://www.fiddler2.com/fiddler2/ .

Best Regards.

 

Answer 3

User591890860 posted

Thanks all for your help. I figured it out later. The web service vendor had written a SoapExtension class where it was expecting a path in the file system that was not present. Once I created the path, it started working.