Proxy and cache POST request queries to remote GraphQL server

myserverhost.conf

upstream my_graphql_server {
        server launchpad.example.host:443 ;
}

server {
    listen 192.168.1.20:443 ssl http2;

    server_name myserverhost.lan;

    ssl_certificate             /usr/local/certificates/cert-wCa2Ie;
    ssl_certificate_key         /usr/local/certificates/cert-wCa2Ie;
    ssl_client_certificate      /usr/local/certificates/cert-eJPfDa;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 5m;

    client_max_body_size 2m;

    root "/var/www/vhosts/myserverhost.lan/public";
    access_log "/var/www/vhosts/myserverhost.lan/logs/proxy_access_ssl_log";
    error_log "/var/www/vhosts/myserverhost.lan/logs/proxy_error_log";

    location @graphql {
        proxy_pass https://my_graphql_server/graphql;
        proxy_http_version    1.1;
        proxy_cache GRAPHQLDEV;
        proxy_cache_methods POST;
        proxy_buffers 8 32k;
        proxy_buffer_size 64k;
        add_header X-Cached $upstream_cache_status;
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
        proxy_set_header      Upgrade $http_upgrade;
        proxy_set_header      Connection 'upgrade';
        proxy_set_header      Host 'launchpad.example.host';
        proxy_set_header      X-Real-IP            $remote_addr;
        proxy_set_header      X-Forwarded-For  $proxy_add_x_forwarded_for;
    }
    
    location / {
        try_files $uri $uri/ @graphql;
    }
}

proxy_cache_test.conf

proxy_cache_path /var/run/graphqldev-cache levels=2:2 keys_zone=GRAPHQLDEV:1m inactive=1m;
proxy_cache_valid 200 301 302 60s;
proxy_cache_key "$request_uri|$request_body";
proxy_cache_use_stale error timeout invalid_header updating http_500;
proxy_cache_lock on;
proxy_cache_lock_age 5s;
proxy_cache_lock_timeout 8s;