Fixes #88

Author: Ron Radtke

android/src/main/java/com/ReactNativeBlobUtil/ReactNativeBlobUtilReq.java

@@ -604,7 +604,7 @@ private void done(Response resp) {
                 ReactNativeBlobUtilFileResp ReactNativeBlobUtilFileResp;
 
                 try {
-                    ReactNativeBlobUtilFileResp = (ReactNativeBlobUtilFileResp) responseBody;
+                    ReactNativeBlobUtilFileResp = new ReactNativeBlobUtilFileResp(responseBody);
                 } catch (ClassCastException ex) {
                     // unexpected response type
                     if (responseBody != null) {

android/src/main/java/com/ReactNativeBlobUtil/Response/ReactNativeBlobUtilFileResp.java

@@ -35,6 +35,11 @@ public class ReactNativeBlobUtilFileResp extends ResponseBody {
     FileOutputStream ofStream;
     boolean isEndMarkerReceived;
 
+    public ReactNativeBlobUtilFileResp(ResponseBody body) {
+        super();
+        this.originalBody = body;
+    }
+
     public ReactNativeBlobUtilFileResp(ReactApplicationContext ctx, String taskId, ResponseBody body, String path, boolean overwrite) throws IOException {
         super();
         this.rctContext = ctx;