Dynamic Cache based on header

nginx.conf

user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log notice;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    proxy_cache_path /path/to/cache1 levels=1:2 keys_zone=cache1:10m max_size=1g inactive=60m
        use_temp_path=off;

    proxy_cache_path /path/to/cache2 levels=1:2 keys_zone=cache2:10m max_size=1g inactive=60m
        use_temp_path=off;

    proxy_cache_path /path/to/cache3 levels=1:2 keys_zone=default_cache:10m max_size=1g inactive=60m
        use_temp_path=off;
        
    map $http_x_client $dynamic_cache {
        ~*service1   cache1;
        ~*service2   cache2;
        default     default_cache;
    }
    
    upstream backend {
        server 127.0.0.1:8000;
    }

    server {

        listen 80;

        location /instrument {
            proxy_cache_valid any 30m;
            proxy_cache $dynamic_cache;
            proxy_pass http://backend;
        }
    }

    server {

        listen 8000;

        location / {
            return 200 "200 OK
upstream_cache_status: $upstream_cache_status
http_x_client: $http_x_client
dynamic_cache: $dynamic_cache\n";
        }

    }

}