Could you allow us following MIME-TYPE: "application/soap+xml" ?
If I try to send a SOAP request I will always get a 415 status code and the message that this content type is not supported (the message isn't from my server because IIS issues HTML and not plain text errors)
Example for a SOAP request:
CODE
POST /SecondLifeSOAP/Service.asmx HTTP/1.1
Host: localhost
Content-Type: application/soap+xml; charset=utf-8
Content-Length: length
<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
<soap12:Body>
<Ping xmlns="http://tempuri.org/" />
</soap12:Body>
</soap12:Envelope>
