diff --git a/src/zutil/MimeTypeUtil.java b/src/zutil/MimeTypeUtil.java
index aea557b..e85d44c 100644
--- a/src/zutil/MimeTypeUtil.java
+++ b/src/zutil/MimeTypeUtil.java
@@ -29,7 +29,6 @@ import zutil.parser.DataNode;
 import zutil.parser.json.JSONParser;
 
 import java.io.*;
-import java.lang.reflect.Array;
 import java.util.*;
 
 /**
@@ -40,7 +39,7 @@ public class MimeTypeUtil {
     // Static variables
 
     private static final ArrayList<MimeType> mimes = new ArrayList<MimeType>();
-    private static final HashMap<String, MimeType> mimesByExtenion = new HashMap<>();
+    private static final HashMap<String, MimeType> mimesByExtension = new HashMap<>();
 
     // Initialize mime types
     static {
@@ -74,13 +73,13 @@ public class MimeTypeUtil {
         mimes.add(mime);
 
         for (String extension : mime.getExtensions()) {
-            mimesByExtenion.put(extension, mime);
+            mimesByExtension.put(extension, mime);
         }
     }
 
 
     public static MimeType getMimeByExtension(String extension) {
-        return mimesByExtenion.get(extension);
+        return mimesByExtension.get(extension);
     }
 
 
diff --git a/src/zutil/net/http/page/HttpJsonPage.java b/src/zutil/net/http/page/HttpJsonPage.java
index 3b5075c..340ff7e 100755
--- a/src/zutil/net/http/page/HttpJsonPage.java
+++ b/src/zutil/net/http/page/HttpJsonPage.java
@@ -6,11 +6,10 @@ import zutil.net.http.HttpPrintStream;
 import zutil.parser.DataNode;
 import zutil.parser.json.JSONWriter;
 
-import java.io.IOException;
 import java.util.Map;
 
 /**
- * @author Ziver on 2016-11-04.
+ * A page handling responses in JSON format.
  */
 public abstract class HttpJsonPage implements HttpPage {
 
@@ -19,16 +18,21 @@ public abstract class HttpJsonPage implements HttpPage {
                         HttpHeader headers,
                         Map<String, Object> session,
                         Map<String, String> cookie,
-                        Map<String, String> request) throws IOException {
+                        Map<String, String> request) {
 
-        out.setHeader("Content-Type", "application/json");
-        JSONWriter writer = new JSONWriter(out);
-        writer.write(jsonRespond(headers, session, cookie, request));
-        writer.close();
+        out.setHeader(HttpHeader.HEADER_CONTENT_TYPE, "application/json");
+        DataNode json = jsonRespond(out, headers, session, cookie, request);
+
+        if (json != null) {
+            JSONWriter writer = new JSONWriter(out);
+            writer.write(json);
+            writer.close();
+        }
     }
 
 
-    protected abstract DataNode jsonRespond(HttpHeader headers,
+    protected abstract DataNode jsonRespond(HttpPrintStream out,
+                                            HttpHeader headers,
                                             Map<String, Object> session,
                                             Map<String, String> cookie,
                                             Map<String, String> request);
diff --git a/src/zutil/ui/Configurator.java b/src/zutil/ui/Configurator.java
index 3637f1d..ed1a51d 100755
--- a/src/zutil/ui/Configurator.java
+++ b/src/zutil/ui/Configurator.java
@@ -197,13 +197,15 @@ public class Configurator<T> {
         for(ConfigurationParam param : params){
             try {
                 param.apply(obj);
+
                 // Logging
                 if(logger.isLoggable(Level.FINE)) {
-                    strParams.append(param.getName());
+                    strParams.append(param.getName()).append(": ");
                     if(param.isTypeString())
-                        strParams.append(": '").append(param.getString()).append("', ");
+                        strParams.append("'").append(param.getString()).append("'");
                     else
-                        strParams.append(": ").append(param.getString()).append(", ");
+                        strParams.append(param.getString());
+                    strParams.append(", ");
                 }
             } catch (IllegalAccessException e) {
                 logger.log(Level.WARNING, null, e);
diff --git a/test/zutil/net/http/page/HttpJsonPageTest.java b/test/zutil/net/http/page/HttpJsonPageTest.java
index 0d8cff9..9727137 100755
--- a/test/zutil/net/http/page/HttpJsonPageTest.java
+++ b/test/zutil/net/http/page/HttpJsonPageTest.java
@@ -3,6 +3,7 @@ package zutil.net.http.page;
 import org.junit.Test;
 import zutil.io.IOUtil;
 import zutil.net.http.HttpHeader;
+import zutil.net.http.HttpPrintStream;
 import zutil.net.http.HttpTestUtil;
 import zutil.parser.DataNode;
 
@@ -18,7 +19,7 @@ public class HttpJsonPageTest {
 
     private HttpJsonPage page = new HttpJsonPage() {
         @Override
-        protected DataNode jsonRespond(HttpHeader headers, Map<String, Object> session, Map<String, String> cookie, Map<String, String> request) {
+        protected DataNode jsonRespond(HttpPrintStream out, HttpHeader headers, Map<String, Object> session, Map<String, String> cookie, Map<String, String> request) {
             return new DataNode(DataNode.DataType.Map);
         }
     };