Override HTTP Headers

For a soap webservice integration I'd like to change the HTTP Header Content-Type. Mendix is sending the value 'application/soap+xml; charset=UTF-8' but the publishing party is requesting 'text/xml'. I've found this out with SOAPUI. In a webservice call you can set HTTP-Headers, but you can't override existing ones. Why is that? How can I solve this issue wihtin Mendix? So no JAVA. Has anyone else had this issue before and how did you solve this?
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