function getContentType(oResponse) {
	if (oResponse && oResponse.headers) {
		for (var sHeader in oResponse.headers) {
			if (sHeader.toLowerCase() === "content-type") {
				return oResponse.headers[sHeader].replace(/([^;]*);.*/, "$1");
			}
		}
	}
	return false;
}
Returns the content-type header of the given response, it searches in a case-insentitive way for
the header

@param {object} oResponse - The response object from which the body property will be used
@return {string|false} Either the content-type header content or false if none is found
@private