Refactor some lines to use better Generics syntax

Refs: #8039

@@ -453,10 +453,10 @@ public class DirectControlServlet extends HttpServlet {
             context.put("httpProtocol", request.getProtocol());
             context.put("httpScheme", request.getScheme());
 
-            Enumeration headerNames = request.getHeaderNames();
-            Map<String, List> headerMap = new HashMap<String, List>();
-            while(headerNames.hasMoreElements()) {
-                String headerName = (String) headerNames.nextElement();
+            Enumeration<String> headerNames = request.getHeaderNames();
+            Map<String, List<String>> headerMap = new HashMap<String, List<String>>();
+            while (headerNames.hasMoreElements()) {
+                String headerName = headerNames.nextElement();
                 headerMap.put(headerName, Collections.list(request.getHeaders(headerName)));
             }
             context.put("httpHeaders", headerMap);
@@ -467,9 +467,9 @@ public class DirectControlServlet extends HttpServlet {
 
             if (result.get("httpHeaders") != null) {
                 Map<String, List<String>> headers = (Map<String,List<String>>) result.get("httpHeaders");
-                for (String headerName : (Set<String>) headers.keySet()) {
-                    for (String value : headers.get(headerName)) {
-                        response.addHeader(headerName, value);
+                for (Map.Entry<String, List<String>> header : headers.entrySet()) {
+                    for (String value : header.getValue()) {
+                        response.addHeader(header.getKey(), value);
                     }
                 }
             }