Nginx+uWSGi+Django long task Bad Gateway error - django

Question

I have a long task in one of my django's views that take 120-200 seconds to generate the response.
For this particular view, Nginx raises 502 Bad Gateway after 1 minute with this error message in the logs:
[error] 7719#7719: *33 upstream prematurely closed connection while reading response header from upstream,
here are my Nginx configurations:
upstream DjangoServer {
server 127.0.0.1:8000;
keepalive 300;
}
location / {
include proxy_params;
proxy_pass http://DjangoServer;
allow all;
proxy_http_version 1.1;
proxy_set_header X-Cluster-Client-Ip $remote_addr;
client_max_body_size 20M;
keepalive_timeout 300;
proxy_connect_timeout 300;
proxy_send_timeout 300;
proxy_read_timeout 300;
send_timeout 300;
}
And here are my uWSGI Configurations:
uid=www-data
gid=www-data
http=127.0.0.1:8000
http-keepalive=300
master=1
vacuum=1
workers=2
threads=5
log-5xx=1
Note:
The Nginx and uWSGI work fine for all other views.
Django development server can run the task with no problem.
After the Nginx 502 error, uWSGI keeps running in the background and completes the job, (according to in view print statements).
If I try to connect to uWSGI via the browser, after a while (less than 120s) it will say ERR_EMPTY_RESPONSE.
You can assume the task like this
def long_task_view(request):
start_time = time.time()
print(start_time)
# doing stuff
time.sleep(130)
print(time.time() - start_time)
return HttpResponse("The result")

Answer 1

you can try increase the time out time of nginx:
vim /etc/nginx/nginx.conf
Add this in http:
http {
...
fastcgi_read_timeout 300;
...
}
But the best practice is to create an asynchronous process to process the method that takes. I usually celery for async task.