XFireServletController adds invalid and useless HTTP header

In XFireServletController.java, method doService, there is a line:

response.setHeader("Content-Type", "UTF-8");

This results in the following line in the http header:

Content-Type: UTF-8

This causes a problem for us, because we have already a correct content type line ("Content-Type: text/xml; charset=UTF-8") in the header, which is, as I suppose, created by the tomcat server we use. So the Content-Type line is duplicate and maybe wrong as well. If you have a look at http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.7 , I'm not sure that setting it simply to "UTF-8" is a valid value.

I think the line should be either left out or be made optional. For my case, it would be best to have an XFire which does add this line to the http header.