nginx/rails cache config example

nginx_cache_full_example.conf

proxy_cache_pass /path/to/cache levels= keys_zone=rails_cache:10m max_size=10g use_temp_path=off inactive=120m;
  
  location / {
    try_files $uri @rails;
  }
  
  location @rails {
    # lets skip authorized user.
    proxy_no_cache $cookie_remember_user_token;
    proxy_cache_bypass $cookie_remember_user_token;
    
    #MANIPULATING HEADER
    
    # since we cannot manage Cache-Control without affecting Rack::Cache, 
    # it's best not to consider it at all  
    proxy_ignore_headers Cache-Control;
    
    # Hiding rails Cache-Control header
    # to be sure we remove max-age from Cache-control
    proxy_hide_header Cache-Control;
    
    # And replacing it with no-cache or max-age=0, must-revalidate
    add_header Cache-Control no-cache;
    
    
    # TUNING NGINX CACHE
    
    # Since we ignoring Cache-Control we need to add proxy_cache_valid
    proxy_cache_valid any 2s;
    
    #return stale in special cases:
    proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;     
    
    # preventing ping hard with same request
    proxy_cache_lock on;
    
    # this really make sense only if you are setting 
    # conditional headers in rails ( fresh_when e.t.c )
    proxy_cache_revalidate on;
    
    # ALTERNATIVE FOR UNCACHEABLE:
    # to return cache only while application busy with last response: 
    # proxy_cache_valid any 0s; 
    # proxy_cache_use_stale updating;
    # proxy_cache_lock on;
}