WebException: The server committed a protocol violation. Section=ResponseStatusLine (call Marketo SOAP API)

I'm trying to call the Marketo SOAP Webservice via ASP.NET / C#. I successfully added the web service reference and tried to call it with this line of code:

SuccessGetLead lead = service.getLead(paramsgetlead);

The problem is I also get this exception:

[WebException: The server committed a protocol violation. Section=ResponseStatusLine]

System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request) +开发者_Go百科263

System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse(WebRequest request) +4

System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) +172

com.marketo.soap.MktMktowsApiService.getLead(ParamsGetLead paramsGetLead) in c:\Users\hubert.grininger\AppData\Local\Temp\Temporary ASP.NET Files\dynaweb2007\82e21235\d41bf12a\App_WebReferences.liqikruc.7.cs:206

_test_marketo.Page_Load(Object sender, EventArgs e) in d:\workspace_c\dynaweb2007_test\marketo.aspx.cs:48

System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14

System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35

System.Web.UI.Control.OnLoad(EventArgs e) +99

System.Web.UI.Control.LoadRecursive() +50

System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

I also tried adding

<system.net>
   <settings>
       <httpWebRequest useUnsafeHeaderParsing = "true" />
   </settings>
</system.net> 

but that didn't help either.

I think the request is never sent to Marketo but the error already occurs on my end.

Thanks for any help or hint.

Solved. Problem was that the wsdl (provided by Marketo) wrongly pointed to localhost as webservice endpoint. I programmatically set the URL via WebServiceObject.Url property and it works now.

Just try to use HTTP/1.0 instead of HTTP/1.1

look at the following code

objWebRequest.ProtocolVersion = System.Net.HttpVersion.Version10;

It worked for me ;-)