REQUEST:
POST /interop/interopC.wsdl HTTP/1.1
Host: soapclient.com
Connection: Keep-Alive
User-Agent: EasySoap++/0.6
Content-Type: text/xml; charset="UTF-8"
SOAPAction: "http://soapinterop.org/"
Content-Length: 576

<E:Envelope
	xmlns:E="http://schemas.xmlsoap.org/soap/envelope/"
	xmlns:A="http://schemas.xmlsoap.org/soap/encoding/"
	xmlns:s="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:y="http://www.w3.org/2001/XMLSchema"
	E:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<E:Header>
<ns1:echoMeStringRequest
	xmlns:ns1="http://other.soapinterop.org/echoheader/"
	s:type="y:string"
	E:mustUnderstand="1">This is a string in the header</ns1:echoMeStringRequest>
</E:Header>
<E:Body>
<m:echoVoid
	xmlns:m="http://soapinterop.org/"/>
</E:Body>
</E:Envelope>


RESPONSE:
HTTP/1.1 500 Internal Server Error
Server: SQLData Server/3.01
Connection: Close
Set-Cookie:SessionId=00705700391502446100132201819601824100676203009;Max-Age=300;Version=1
Content-Type: text/xml; charset="utf-8"
Content-Length: 780

<?xml version="1.0"?>
<SOAP-ENV:Envelope  xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> 
   <SOAP-ENV:Body> <SOAP-ENV:Fault>
           <faultcode>SOAP-ENV:MustUnderstand</faultcode>
           <faultstring>An invalid SOAP header, the server doesn't understand a specified SOAP header name.</faultstring>
           <faultactor>/interop/interopC.wsdl</faultactor>
           <e:sqldatafaultdetails xmlns:e="http://sqldata.com/soapfault"><detail>
               <faultdetails> 
                 <message>One of mustUnderstand headers could not be processed.</message> 
                 <errorcode>1531</errorcode>
               </faultdetails> 
           </detail> </e:sqldatafaultdetails>
    </SOAP-ENV:Fault> </SOAP-ENV:Body> 
</SOAP-ENV:Envelope>