encountering a soap error while attempting to access an ASP.NET web service

My ASP.Net test web service is operational, but I am consistently encountering 500 errors stating:

"System.InvalidOperationException: Request format is invalid: text/xml.
   at System.Web.Services.Protocols.HttpServerProtocol.ReadParameters()
   at System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()
"

This issue arises when invoking the service using JavaScript.

The web service itself is fairly straightforward - it accepts a single parameter as a string and then sends it back to the client. Assistance in resolving this matter would be greatly appreciated!

Access code here

javascriptasp.netsoap

Answer №1

In case it can assist anyone, the solution was ensuring the SOAPAction was correctly set in the header:

$.ajax({ method: "post", url: endpoint, contentType: "text/xml", data: soapData, dataType: "xml", processData: false, beforeSend: function( request ){ request.setRequestHeader( "SOAPAction", "http://example.com/Services/MethodName" ); }, ....

Answer №2

Ensure that the mess variable does not include a GET-style query string like '?a=1&b=2'. It should be sent in POST format, such as JSON. Consider modifying contentType to 

contentType: "application/json; charset=utf-8"

$.ajax({
                url: service,
                type: "POST",
                dataType: "xml",
                data: '{key: value}',
                complete: endTest,
                error: processError,
                contentType: "application/json; charset=utf-8",
        });

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