Filesize fix, return exact size value without downloading image (#705)

* Filesize fix, return exact size value without dowloading image
Issue:102319

* Removed user agent request property

---------

Co-authored-by: tomas-sexenian <tsexenian@genexus.com>

Author: tomas-sexenian

java/src/main/java/com/genexus/GxImageUtil.java

@@ -7,6 +7,7 @@
 import java.awt.image.BufferedImage;
 import java.io.*;
 import java.net.URL;
+import java.net.URLConnection;
 
 import com.genexus.db.driver.ResourceAccessControlList;
 import com.genexus.util.GxFileInfoSourceType;
@@ -49,13 +50,10 @@ public static long getFileSize(String imageFile){
 		IHttpContext httpContext = com.genexus.ModelContext.getModelContext().getHttpContext();
 		if (imageFile.toLowerCase().startsWith("http://") || imageFile.toLowerCase().startsWith("https://") ||
 			(httpContext.isHttpContextWeb() && imageFile.startsWith(httpContext.getContextPath()))){
-			try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
-				BufferedImage image = ImageIO.read(new URL(GXDbFile.pathToUrl( imageFile, httpContext)).openStream());
-				String extension = imageFile.substring(imageFile.lastIndexOf(".") + 1);
-				ImageIO.write(image, extension, baos);
-				baos.flush();
-				byte[] imageInByte = baos.toByteArray();
-				return imageInByte.length;
+			try {
+				URL url = new URL(imageFile);
+				URLConnection connection = url.openConnection();
+				return Long.parseLong(connection.getHeaderField("Content-Length"));
 			} catch (Exception e) {
 				log.error("getFileSize " + imageFile + " failed" , e);
 			}