Nginx isn't storing cache - nginx

Question

I'm trying to allow nginx caching in the simplest form. But for some reason it's not working. I'm currently using nginx with gunicorn and flask on an ec2 instance.
This is my /etc/nginx/nginx.conf file:
user nginx;
...
proxy_cache_path /var/cache/nginx keys_zone=mycache:10m;
proxy_cache_methods GET HEAD POST;
server {
listen 80;
access_log /var/log/nginx/agori.access.log main;
error_log /var/log/nginx/agori.error.log;
location / {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_cache mycache;
proxy_cache_valid any 48h;
proxy_buffering on;
proxy_pass http://unix:/home/ec2-user/src/project.sock;
}
}
when check the /var/cache/nginx folder, it's empty. These are the folders permissions:
drwxrwxrwx 2 nginx root 6 May 13 14:03 nginx
This is the request and respond headers:
PS: This is on mobile(ios)

Answer 1

It sounds to me that something in your Nginx config might not be correct (syntax error or not supported by your Nginx version). In most of the case I encountered so far that was the case for me.
You probably know Nginx' reverse proxy example which features the following configuration
http {
proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=STATIC:10m inactive=24h max_size=1g;
server {
location / {
proxy_pass http://1.2.3.4;
proxy_set_header Host $host;
proxy_buffering on;
proxy_cache STATIC;
proxy_cache_valid 200 1d;
proxy_cache_use_stale error timeout invalid_header updating
http_500 http_502 http_503 http_504;
}
}
}
I tried to compare that with your configuration file and I my debugging approach would be:
Does nginx log your requests in access_log?
Try to remove whether the example configuration file works after minimal modifications.
Replace the any with a 200 for a start and see whether that works.
If that works, put in step by step all additional config lines like the proxy_cache_methods line.