Classic asp - only receiving part of soap response - soap

Question

I am trying to call a soap request from classic asp (it will be updated at some later point, but for now it stays classic asp), but I'm only getting half of the response?
When I use the request string in SoapUI, I get the response I'm looking for, but in asp I only receive part of the response??
ASP Request:
Set oXmlHTTP = CreateObject("Microsoft.XMLHTTP")
oXmlHTTP.Open "POST", "http://webservice-string?wsdl", False
oXmlHTTP.setRequestHeader "Content-Type", "text/xml; charset=utf-8"
oXmlHTTP.setRequestHeader "SOAPAction", "urn:action"
SOAPRequest = _
"<?xml version=""1.0"" encoding=""utf-8""?>" &_
"<soapenv:Envelope xmlns:soapenv=""http://schemas.xmlsoap.org/soap/envelope/"" xmlns:head=""http://header.com"" xmlns:ser=""http://service.com"" xmlns:add=""http://service.com/domain/address"">" &_
"<soapenv:Header>" &_
"<head:OnBehalfOfUserId>stine</head:OnBehalfOfUserId>" &_
"<head:RequestId>?</head:RequestId>" &_
"<head:AuthenticationHeader>" &_
"<head:SessionID>?</head:SessionID>" &_
"</head:AuthenticationHeader>" &_
"</soapenv:Header>" &_
"<soapenv:Body>" &_
"<ser:searchVisitationRequest>" &_
"<ser:UserId>Stine</ser:UserId>" &_
"<ser:RequestId>?</ser:RequestId>" &_
"<add:SomeId>1234</add:SomeId>" &_
"</ser:searchVisitationRequest>" &_
"</soapenv:Body>" &_
"</soapenv:Envelope>"
On Error Resume Next
oXmlHTTP.send SOAPRequest
If Err.Number Then
Err.Clear
Else
SOAPResponse = oXmlHTTP.responseXML.text
End If
On Error Goto 0
if len(SOAPResponse) > 0 then
Response.Write SOAPResponse
end if
ASP Response:
2018-06-25T09:56:36.016+02:00server_ID{bla bla}5
SoapUI response
(made from same request - contains "SearchVisitation" which is the result I need!)
<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">
<S:Body>
<searchVisitationResponse xmlns="http://service.com">
<ReplyInfo>
<ReplyTimestamp>2018-06-25T08:47:48.204+02:00</ReplyTimestamp>
<ServerId>server_ID</ServerId>
<StatusMessage>{bla bla}</StatusMessage>
<TransactionDuration>3</TransactionDuration>
</ReplyInfo>
<SearchVisitation>
<OtherID>12345678</OtherID>
<SearchVisitationID>
<SubscriptionNo>Test1</SubscriptionNo>
</SearchVisitationID>
</SearchVisitation>
</searchVisitationResponse>
</S:Body>
</S:Envelope>
What am I doing wrong?

Answer 1

Turns out that
oXmlHTTP.setRequestHeader "SOAPAction", "urn:action"
was the part that would cause the request to error (I've - again - triple checked that the urn:action was correct).
Removing it gave me the correct response.