Server returns "100 continue"

[Noam_h]

Hi all. Calling this web service:

POST /WebService2/Service1.asmx HTTP/1.1
Host: WKSI105080A22
Content-Type: text/xml; charset=utf-8
Content-Length: 396
SOAPAction: "http://WKSI105080A22/WebService2/Multiply"

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelop e xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http ://www.w3.org/2001/XMLSchema"
xmlns:soap="htt p://schemas.xmlsoap .org/soap/envelope/">
<soap:Body>
<Multiply xmlns="http://WKSI105080A22/WebService2/">
<a>24</a>
<b>10</b>
</Multiply>
</soap:Body>
</soap:Envelope>

I get in response:

HTTP/1.1 100 Continue
Server: Microsoft-IIS/5.1
Date: Tue, 10 Jan 2006 08:38:16 GMT

While calling via GET and POST returns the correct response.

Any idea?