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

StackOverflow https://stackoverflow.com/questions/4279070

  •  28-09-2019
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Question

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) +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.

Was it helpful?

Solution

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.

OTHER TIPS

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 ;-)

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