explicitly set text/html as the conntent-type response header field in ClientConfigurationServlet;

this as temporary aftermath for bug5153 to make sure clients take HTML documents as such
and not as the default text/plain as reported for some cases when the URL contained
queries, e.g., for sailtracks.sapsailing.com

java/com.sap.sse.debranding/META-INF/MANIFEST.MF

@@ -8,6 +8,7 @@ Bundle-Vendor: SAP
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Import-Package: javax.servlet;version="3.1.0",
  javax.servlet.http;version="3.1.0",
+ javax.ws.rs.core;version="1.1.1",
  org.apache.http
 Bundle-ClassPath: .
 Bundle-ActivationPolicy: lazy

java/com.sap.sse.debranding/src/com/sap/sse/debranding/ClientConfigurationServlet.java

@@ -12,6 +12,7 @@ import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+import javax.ws.rs.core.MediaType;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.http.HttpStatus;
@@ -82,6 +83,7 @@ public class ClientConfigurationServlet extends HttpServlet {
         final String servletPath = req.getServletPath();
         final byte[] cachedPage;
         final String pageKey = generateKey(servletPath, deBrandingActive);
+        resp.setContentType(MediaType.TEXT_HTML);
         if ((cachedPage = cache.get(pageKey)) != null) {
             IOUtils.write(cachedPage, resp.getOutputStream());
         } else {