Failed to upload file using jQuery ajax to targeted API

Failed to upload file using jQuery ajax to targeted API

Hi, 
I am failed to send a POST request using jQuery Ajax via targeted API. Please find below code,
When do a console, it straight go to failed condition.

Please help.

  1. var fd = new FormData();
  2. var files = $('#oltnpefile')[0].files[0];
  3. fd.append('upload_file',files);
  5. console.log(files);

  7. $.ajax({
  8.         url: '/api/v1/olt/uploadfile/',
  9. type: 'POST',
  10. dataType : "json",
  11.         data: fd,
  12.         contentType: false,
  13. processData: false,
  14.         success: function(response){
  15. setTimeout(function(){
  16. console.log(response);
  17.                     
  18. if(response == 0){
  19. $('#success-upload').modal('show');
  20. }else{
  21. alert('File Format Not Supported');
  22. }
  23. },1400);
  24.         },
  25. });