nginx.conf

worker_processes 4;
daemon off;

pid /var/run/nginx.pid;
error_log stdout info;

events {
    worker_connections 1024;
}

error_log stderr info;

env IMAGING_ALLOWED_ORIGINS;
env IMAGING_MAX_WIDTH;
env IMAGING_MAX_HEIGHT;
env IMAGING_DEFAULT_QUALITY;
env IMAGING_DEFAULT_STRIP;
env IMAGING_MAX_OPERATIONS;
env IMAGING_DEFAULT_FORMAT;
env IMAGING_MAX_CONCURRENCY;
env IMAGING_NAMED_OPERATIONS_FILE;

http {
    include 'resolvers.conf';
    
    merge_slashes off;
    lua_shared_dict imaging 1m;

    init_worker_by_lua_block {
        local imaging = require "resty.imaging"
        imaging.init{
            shm_name = "imaging"
        }
    }

    proxy_cache_path /tmp/imaging-frontend-cache
        levels=1:2
        keys_zone=imaging-frontend-cache:10m
        max_size=2g
        inactive=60m
        use_temp_path=off;

    proxy_next_upstream_tries 2;
    proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;

    upstream imaging {
        keepalive 32;
        server 127.0.0.1:8081;
    }

    server {
        listen 8080;
        server_name default_server;

        proxy_cache imaging-frontend-cache;
        proxy_cache_key $host$uri$is_args$args;
        proxy_cache_lock on;

        proxy_buffers 16 128k;
        proxy_busy_buffers_size 256k;

        add_header X-Imaging-Status $upstream_cache_status;

        proxy_cache_valid 200 1h;

        location /status {
            access_by_lua_block {
                local imaging = require "resty.imaging"
                imaging.status_page()
            }
        }

        location / {
            proxy_pass http://imaging;
            proxy_http_version 1.1;
            proxy_set_header Connection "";
        
            log_by_lua_block {
                local imaging = require "resty.imaging"
                imaging.log_phase()
            }
        }
    }

    server {
        listen 8081;
        server_name default_server;
        lua_ssl_trusted_certificate '/etc/ssl/certs/ca-certificates.crt';
        lua_ssl_verify_depth 10;

        keepalive_timeout 120s;
        keepalive_requests 100;

        set $imaging_source_domain "static:8080";

        location ~ ^/(?<imaging_params>.+?)\|(?<imaging_base_url>.*)$ {

            expires max;
            add_header Pragma public;
            add_header Cache-Control "public";

            set $imaging_url "http://$imaging_source_domain$imaging_base_url$is_args$args";

            access_by_lua_block {
                local imaging = require "resty.imaging"
                imaging.access_phase()
            }

            content_by_lua_block {
                local imaging = require "resty.imaging"
                imaging.request_handler()
            }
        }
    }
}