diff --git a/src/main/java/org/gcube/datatransfer/resolver/http/HttpResolver.java b/src/main/java/org/gcube/datatransfer/resolver/http/HttpResolver.java
index af0e2e4..84cb81b 100644
--- a/src/main/java/org/gcube/datatransfer/resolver/http/HttpResolver.java
+++ b/src/main/java/org/gcube/datatransfer/resolver/http/HttpResolver.java
@@ -3,7 +3,6 @@ package org.gcube.datatransfer.resolver.http;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.net.SocketException;
 import java.net.URL;
 import java.net.URLConnection;
 import java.net.URLStreamHandler;
@@ -44,8 +43,7 @@ public class HttpResolver extends HttpServlet {
 
 	}
 
-	protected void doGet(HttpServletRequest request,
-			HttpServletResponse response) throws IOException {
+	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
 	
 
 		logger.info("The http session id is: " + request.getSession().getId());
@@ -90,10 +88,9 @@ public class HttpResolver extends HttpServlet {
 
 		
 		logger.debug("URI = "+ uri);
-
+		InputStream in = null;
 		try {
 
-
 			OutputStream out = response.getOutputStream();
 			
 			if (fileName != null)
@@ -116,9 +113,7 @@ public class HttpResolver extends HttpServlet {
 			});
 		
 			URLConnection uc = null;
-			
-			InputStream in = null;
-			
+
 			try {
 				uc = ( URLConnection ) url.openConnection ( );
 				in = uc.getInputStream();
@@ -138,37 +133,50 @@ public class HttpResolver extends HttpServlet {
 			in.close();
 			*/
 			
+			if(in!=null)
+			
 			//CHANGED BY FRANCESCO M.
 			try {
 				
 				IOUtils.copy(in, out);
 				
-			} catch (SocketException e){
-				 if (!e.getClass().getSimpleName().equals("ClientAbortException"))
-				    throw e;
-				 else
-					 logger.warn("Skipping ClientAbortException: "+e.getMessage());
+			} catch (IOException e){
+				logger.warn("IOException class name: "+e.getClass().getSimpleName());
+				if (e.getClass().getSimpleName().equals("ClientAbortException"))
+					logger.warn("Skipping ClientAbortException: "+e.getMessage());
+				else
+					throw e; //Sending Exceptions
+				
+			}	catch (NullPointerException e) {
+				logger.warn("NullPointerException: input stream is null, skipping printStrackTrace");
+				sendErrorQuietly(response, 404);
+				
 			} finally {
 				IOUtils.closeQuietly(in);
 				IOUtils.closeQuietly(out);
 			}
 			
 		} catch (Exception e) {
-//			e.printStackTrace();
 			logger.error("Exception:", e);
 //			response.sendError(404);
-			
-			//CHANGED BY FRANCESCO M.
-			if(!response.isCommitted())
-				response.sendError(404);
-			else
-				logger.warn("Response already committed, skipped send Error 404");
-			
+			IOUtils.closeQuietly(in);
+			sendErrorQuietly(response, 404);
 			return;
 		}
 
 	}
 	
+	protected void sendErrorQuietly(HttpServletResponse response, int code){
+		
+		if(response!=null){
+			try {
+				response.sendError(code);
+			} catch (IOException ioe) {
+				 // ignore
+			}
+		}
+	}
+	
 	protected void doPost(HttpServletRequest request,
 			HttpServletResponse response) throws IOException {
 		doGet(request,response);