Django-ajax: CSRF verification failed. Request aborted - ajax

Question

I am working with django server side form to save details in DB.
<form id="form_save_file" enctype="multipart/form-data">
{% csrf_token %}
<label class="control-label col-md-4">File:</label>
<div class="col-md-8">
{{form.fa_file}}
</div>
<label class="control-label col-md-4">Name:</label>
<div class="col-md-8">
{{form.name}}
</div>
</form>
I am using ajax to post request.
$("#form_save_file").submit(function(e) {
$.ajax({
type: "POST",
url: '/url/',
data: $("#form_save_file").serialize(),
contentType: false,
processData: false,
success: function(data){}
});
I have included middleware classes in settings.py
MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'request.middleware.RequestMiddleware'
)
When I removed contentType and processData in ajax request, request.FILES is empty in views.py and otherthings are working fine.

Answer 1

contentType option to false is used for multipart/form-data forms that
pass files.
When one sets the contentType option to false, it forces jQuery not to
add a Content-Type header, otherwise, the boundary string will be
missing from it. Also, when submitting files via multi-part/form one
must leave the processData flag set to false, otherwise, jQuery will
try to convert your FormData into a string, which will fail.
To try and fix your issue:
You are using jQuery's .serialize() method which creates a text string
in standard URL-encoded notation.
You need to pass un-encoded data when using "contentType: false".
Try using "new FormData" instead of .serialize():
Source: https://stackoverflow.com/a/20863123/3345051
Revised Code:
$("#form_save_file").submit(function(e) {
e.preventDefault();
var $this = $(this);
var postURL = '/url/';
var formData = new FormData(this);
$.ajax({
type: "POST",
url: postURL,
data: formData,
mimeType: "multipart/form-data",
contentType: false,
cache: false,
processData: false
})
.done(function(response) {
// Do something if POST is successful
})
.fail(function() {
// Do something if POST is unsuccessful
})
})

Answer 2

disabled csrf on particular view with #csrf_exempt decorator and build custom security with a random number/string