ASP.NET server not sending httpresponse to ajax post call after file save

Question

Im making a jquery ajax post call, and the .success method is being called, but the response data is empty.

Javascript:

$.ajax({
        type: 'post',
        url: '/MediaUploader/fileUpload',
        data: formData,
        contentType: false,
        processData: false,
    })
        .done(function (data) {
            //Data 
        })

The success function is called, but the data is empty.

Controller:

[HttpPost]
public ActionResult FileUpload() {
    //code
    file.SaveAs(pathToSave);
    return Json(str_image);

When called, the response is empty:

However, commenting out the file.SaveAs, or returning before it, causes the respond to go through:

[HttpPost]
public ActionResult FileUpload() {
    //code
    //file.SaveAs(pathToSave);
    return Json(str_image);

When debugging, the file.SaveAs doesn't throw any exceptions, and in both cases the return is reached. Also, this problem only is occurring on the remote. On local host both versions work fine.

The response doesnt go through only after the file.SaveAs on remote server.

It's an HttpPostedFile containing an image. I should mention when called the file is successfully uploaded to the server — Narek Daduryan, Aug 23 '18 at 00:08
hmm.. not entirely certain, try changing your `ActionResult` to `JsonResult` and run your scenario again. — Brett Caswell, Aug 23 '18 at 00:42
was actually surprised to see this is valid Json text response: https://stackoverflow.com/questions/7487869/is-this-simple-string-considered-valid-json .. I suppose I'm still pre 2014 on this :P — Brett Caswell, Aug 23 '18 at 00:48
did you check the directory permission you are saving in(in remote server)? it should have write permission for your app pool user — Reza Ebadi, Aug 23 '18 at 01:04

score 0 · Answer 1 · answered Aug 23 '18 at 02:03

0

Fixed, it was a problem with directory permissions.

(weird, i didnt think it's an issue because the files were being uploaded successfully anyway)

answered Aug 23 '18 at 02:03

Narek Daduryan

235
1
5

You should have a try-catch block to wrap your code to capture any exception and send out a "success" or "failure" response to your ajax call. Another point is to capture the ajax error and write into the console: failure: function () { console.log("Error in ajax call"); } – TejSoft Aug 23 '18 at 04:13

ASP.NET server not sending httpresponse to ajax post call after file save

1 Answers1