Ggtcf

I'm currently developing a web NER application with following stack:

1. Ubuntu 18.04.1 x64


2. nginx version: nginx/1.14.0 (Ubuntu)


3. Django 1.11.20

(I just followed this tutorial https://www.digitalocean.com/community/tutorials/how-to-set-up-django-with-postgres-nginx-and-gunicorn-on-ubuntu-16-04)

My goal is to create a REST API endpoint. Because I do not use any Django model, ive decided not to use Django rest api framework. I have created a simple view handler function:

@csrf_exempt
def test(request):
 data = json.loads(request.body.decode('utf8'))

 #do some tensorflow stuff here, and return predictions

 data['res'] = "String that might contain unicode chars, e.g č,š or others"
 return JsonResponse(data, safe=False)

And I a call function from FE:

var url = baseURL + "/ner/api/predict"
var xmlhttp = new XMLHttpRequest();
var data = 
 "sentence" : "String that might contain unicode chars, e.g č,š or others"

xmlhttp.onreadystatechange = function() 
 if (this.readyState == 4 && this.status == 200) 
 var response = JSON.parse(this.responseText);
 console.log(response )
 
;
xmlhttp.open("POST", url, true);
xmlhttp.setRequestHeader('Content-type', 'application/json')
xmlhttp.send(JSON.stringify(data));

This works well in my local dev. environment (win10 + django). Problem arises when I push this codebase to server, CORS seems to be a problem.

ner.js:83 OPTIONS <url here>/ner/api/predict 500 (Internal Server Error)
<url here>/:1 Access to XMLHttpRequest at '<url here>/ner/api/predict' from origin '<url here>' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status.

So I tried to edit my nginx configuration but I cant solved this.

 location / 
 add_header Access-Control-Allow-Origin '*' always;
 add_header Access-Control-Allow-Credentials true;
 add_header Access-Control-Allow-Methods 'GET, POST, PUT, DELETE, OPTIONS' always;
 add_header Access-Control-Allow-Headers 'Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Sin$
 add_header Access-Control-Max-Age 1728000 always;
 include proxy_params;
 proxy_connect_timeout 100s;
 proxy_send_timeout 100s;
 proxy_read_timeout 100s;
 proxy_pass http://unix:/home/<path>.sock;
 

Is there a way how to fix this issue?
Thank you