Why Tomcat always return "text/html;"? [closed]

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Tomcat always returns http header Content-Type as "text/html;charset=ISO-8859-1", if I set it in my JSP page via 'response.setContentType("application/xml")' or <%@page contentType="application/xml" %> still same. I use Tomcat 7.0.5, but it also occurs in Tomcat 6 and 5?

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You've to define some content type, not an empty one. If it's supposed to be generic text/plain content, then do so:

<%@page contentType="text/plain" %>

You can find an overview of most common content types here.

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Check you're setting the content type before sending any output.