fix https://wso2.org/jira/browse/EMM-1880

components/mobile-plugins/android-plugin/org.wso2.carbon.device.mgt.mobile.android.api/src/main/java/org/wso2/carbon/mdm/services/android/services/impl/DeviceManagementAdminServiceImpl.java

@@ -72,6 +72,7 @@ import javax.ws.rs.Produces;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.io.IOException;
+import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLConnection;
@@ -1018,22 +1019,11 @@ public class DeviceManagementAdminServiceImpl implements DeviceManagementAdminSe
         }
     }
 
-    private static boolean hasValidAPKContentType(String contentType){
-        if (contentType != null){
-            switch (contentType) {
-                case MediaType.APPLICATION_OCTET_STREAM:
-                case "application/android":
-                    return true;
-            }
-        }
-        return false;
-    }
-
     private static void validateApplicationUrl(String apkUrl) {
         try {
             URL url = new URL(apkUrl);
             URLConnection conn = url.openConnection();
-            if (!hasValidAPKContentType(conn.getContentType())) {
+            if(((HttpURLConnection) conn).getResponseCode() != HttpURLConnection.HTTP_OK) {
                 String errorMessage = "URL is not pointed to a downloadable file.";
                 log.error(errorMessage);
                 throw new BadRequestException(