diff --git a/demo/src/main/java/com/df/angularfileupload/FileUpload.java b/demo/src/main/java/com/df/angularfileupload/FileUpload.java
index 9b1c8bbb..ec6a6cd0 100644
--- a/demo/src/main/java/com/df/angularfileupload/FileUpload.java
+++ b/demo/src/main/java/com/df/angularfileupload/FileUpload.java
@@ -19,140 +19,141 @@
 import java.util.logging.Logger;
 
 public class FileUpload extends HttpServlet {
-	private static final long serialVersionUID = -8244073279641189889L;
-	private final Logger log = Logger.getLogger(FileUpload.class.getName());
+    private static final long serialVersionUID = -8244073279641189889L;
+    private final Logger log = Logger.getLogger(FileUpload.class.getName());
 
-	class SizeEntry {
-		public int size;
-		public LocalDateTime time;
-	}
-	static Map<String, SizeEntry> sizeMap = new ConcurrentHashMap<>();
-	int counter;
+    class SizeEntry {
+        public int size;
+        public LocalDateTime time;
+    }
 
-	@Override
-	protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
-		try {
-			clearOldValuesInSizeMap();
+    static Map<String, SizeEntry> sizeMap = new ConcurrentHashMap<>();
+    int counter;
 
-			String ipAddress = req.getHeader("X-FORWARDED-FOR");
-			if (ipAddress == null) {
-				ipAddress = req.getRemoteAddr();
-			}
-			if (req.getMethod().equalsIgnoreCase("GET")) {
-				if (req.getParameter("restart") != null) {
-					sizeMap.remove(ipAddress + req.getParameter("name"));
-				}
-				SizeEntry entry = sizeMap.get(ipAddress + req.getParameter("name"));
-				res.getWriter().write("{\"size\":" + (entry == null ? 0 : entry.size) + "}");
-				res.setContentType("application/json");
-				return;
-			}
-			req.setCharacterEncoding("utf-8");
-			if (!"OPTIONS".equalsIgnoreCase(req.getMethod()) && req.getParameter("errorCode") != null) {
+    @Override
+    protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
+        try {
+            clearOldValuesInSizeMap();
+
+            String ipAddress = req.getHeader("X-FORWARDED-FOR");
+            if (ipAddress == null) {
+                ipAddress = req.getRemoteAddr();
+            }
+            if (req.getMethod().equalsIgnoreCase("GET")) {
+                if (req.getParameter("restart") != null) {
+                    sizeMap.remove(ipAddress + req.getParameter("name"));
+                }
+                SizeEntry entry = sizeMap.get(ipAddress + req.getParameter("name"));
+                res.getWriter().write("{\"size\":" + (entry == null ? 0 : entry.size) + "}");
+                res.setContentType("application/json");
+                return;
+            }
+            req.setCharacterEncoding("utf-8");
+            if (!"OPTIONS".equalsIgnoreCase(req.getMethod()) && req.getParameter("errorCode") != null) {
 //				res.getWriter().write(req.getParameter("errorMessage"));
 //				res.getWriter().flush();
-				res.sendError(Integer.parseInt(req.getParameter("errorCode")), req.getParameter("errorMessage"));
-				return;
-			}
-			StringBuilder sb = new StringBuilder("{\"result\": [");
-			
-			if (req.getHeader("Content-Type") != null
-					&& req.getHeader("Content-Type").startsWith("multipart/form-data")) {
-				ServletFileUpload upload = new ServletFileUpload();
+                res.sendError(Integer.parseInt(req.getParameter("errorCode")), req.getParameter("errorMessage"));
+                return;
+            }
+            StringBuilder sb = new StringBuilder("{\"result\": [");
+
+            if (req.getHeader("Content-Type") != null
+                    && req.getHeader("Content-Type").startsWith("multipart/form-data")) {
+                ServletFileUpload upload = new ServletFileUpload();
 
-				FileItemIterator iterator = upload.getItemIterator(req);
+                FileItemIterator iterator = upload.getItemIterator(req);
 
-				while (iterator.hasNext()) {
-					FileItemStream item = iterator.next();
-					sb.append("{");
-					sb.append("\"fieldName\":\"").append(item.getFieldName()).append("\",");
-					if (item.getName() != null) {
-						sb.append("\"name\":\"").append(item.getName()).append("\",");
-					}
-					if (item.getName() != null) {
-						sb.append("\"size\":\"").append(size(ipAddress + item.getName(), item.openStream())).append("\"");
-					} else {
-						sb.append("\"value\":\"").append(read(item.openStream()).replace("\"", "'")).append("\"");
-					}
-					sb.append("}");
-					if (iterator.hasNext()) {
-						sb.append(",");
-					}
-				}
-			} else {
-				sb.append("{\"size\":\"" + size(ipAddress, req.getInputStream()) + "\"}");
-			}
+                while (iterator.hasNext()) {
+                    FileItemStream item = iterator.next();
+                    sb.append("{");
+                    sb.append("\"fieldName\":\"").append(item.getFieldName()).append("\",");
+                    if (item.getName() != null) {
+                        sb.append("\"name\":\"").append(item.getName()).append("\",");
+                    }
+                    if (item.getName() != null) {
+                        sb.append("\"size\":\"").append(size(ipAddress + item.getName(), item.openStream())).append("\"");
+                    } else {
+                        sb.append("\"value\":\"").append(read(item.openStream()).replace("\"", "'")).append("\"");
+                    }
+                    sb.append("}");
+                    if (iterator.hasNext()) {
+                        sb.append(",");
+                    }
+                }
+            } else {
+                sb.append("{\"size\":\"" + size(ipAddress, req.getInputStream()) + "\"}");
+            }
 
-			sb.append("]");
-			sb.append(", \"requestHeaders\": {");
-			@SuppressWarnings("unchecked")
-			Enumeration<String> headerNames = req.getHeaderNames();
-			while (headerNames.hasMoreElements()) {
-				String header = headerNames.nextElement();
-				sb.append("\"").append(header).append("\":\"").append(req.getHeader(header)).append("\"");
-				if (headerNames.hasMoreElements()) {
-					sb.append(",");
-				}
-			}
-			sb.append("}}");
-			res.setCharacterEncoding("utf-8");
-			res.getWriter().write(sb.toString());
-		} catch (Exception ex) {
-			throw new ServletException(ex);
-		}
-	}
+            sb.append("]");
+            sb.append(", \"requestHeaders\": {");
+            @SuppressWarnings("unchecked")
+            Enumeration<String> headerNames = req.getHeaderNames();
+            while (headerNames.hasMoreElements()) {
+                String header = headerNames.nextElement();
+                sb.append("\"").append(header).append("\":\"").append(req.getHeader(header)).append("\"");
+                if (headerNames.hasMoreElements()) {
+                    sb.append(",");
+                }
+            }
+            sb.append("}}");
+            res.setCharacterEncoding("utf-8");
+            res.getWriter().write(sb.toString());
+        } catch (Exception ex) {
+            throw new ServletException(ex);
+        }
+    }
 
-	private void clearOldValuesInSizeMap() {
-		if (counter++ == 100) {
-			for (Map.Entry<String, SizeEntry> entry : sizeMap.entrySet()) {
-                		if (entry.getValue().time.isBefore(LocalDateTime.now().minusHours(1))) {
-                			sizeMap.remove(entry.getKey());
-                		}
-            		}
-        	 	counter = 0;
-		}
-	}
+    private void clearOldValuesInSizeMap() {
+        if (counter++ == 100) {
+            for (Map.Entry<String, SizeEntry> entry : sizeMap.entrySet()) {
+                if (entry.getValue().time.isBefore(LocalDateTime.now().minusHours(1))) {
+                    sizeMap.remove(entry.getKey());
+                }
+            }
+            counter = 0;
+        }
+    }
 
-	protected int size(String key, InputStream stream) {
-		int length = sizeMap.get(key) == null ? 0 : sizeMap.get(key).size;
-		try {
-			byte[] buffer = new byte[200000];
-			int size;
-			while ((size = stream.read(buffer)) != -1) {
-				length += size;
-				SizeEntry entry = new SizeEntry();
-				entry.size = length;
-				entry.time = LocalDateTime.now();
-				sizeMap.put(key, entry);
+    protected int size(String key, InputStream stream) {
+        int length = sizeMap.get(key) == null ? 0 : sizeMap.get(key).size;
+        try {
+            byte[] buffer = new byte[200000];
+            int size;
+            while ((size = stream.read(buffer)) != -1) {
+                length += size;
+                SizeEntry entry = new SizeEntry();
+                entry.size = length;
+                entry.time = LocalDateTime.now();
+                sizeMap.put(key, entry);
 //				 for (int i = 0; i < size; i++) {
 //				 System.out.print((char) buffer[i]);
 //				 }
-			}
-		} catch (IOException e) {
-			throw new RuntimeException(e);
-		}
-		System.out.println(length);
-		return length;
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        System.out.println(length);
+        return length;
 
-	}
+    }
 
-	protected String read(InputStream stream) {
-		StringBuilder sb = new StringBuilder();
-		BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
-		try {
-			String line;
-			while ((line = reader.readLine()) != null) {
-				sb.append(line);
-			}
-		} catch (IOException e) {
-			throw new RuntimeException(e);
-		} finally {
-			try {
-				reader.close();
-			} catch (IOException e) {
-				//ignore
-			}
-		}
-		return sb.toString();
-	}
+    protected String read(InputStream stream) {
+        StringBuilder sb = new StringBuilder();
+        BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
+        try {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                sb.append(line);
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        } finally {
+            try {
+                reader.close();
+            } catch (IOException e) {
+                //ignore
+            }
+        }
+        return sb.toString();
+    }
 }