rpc_proxy.conf

worker_processes auto;

events {
    worker_connections 2048;
}

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

    # Add error logging
    error_log /dev/stderr debug;
    access_log /dev/stdout;

    # Cache settings
    proxy_cache_path /tmp/nginx_cache levels=1:2 keys_zone=rpc_cache:10m max_size=10g inactive=60m use_temp_path=off;

    # Define allowed origins
    map $http_origin $is_allowed_origin {
        default 0;
        "http://localhost:3000" 1;
        "https://alpha.higherrrrrrr.fun" 1;
    }

    server {
        listen 8080;

        location / {
            # Check if origin is allowed
            if ($is_allowed_origin = 0) {
                return 403;
            }

            # Remove CORS headers from upstream
            proxy_hide_header 'Access-Control-Allow-Origin';
            proxy_hide_header 'Access-Control-Allow-Methods';
            proxy_hide_header 'Access-Control-Allow-Headers';
            proxy_hide_header 'Access-Control-Allow-Credentials';
            proxy_hide_header 'Access-Control-Max-Age';

            # Add our CORS headers
            add_header 'Access-Control-Allow-Origin' '*' always;
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
            add_header 'Access-Control-Allow-Headers' 'Content-Type,Authorization' always;
            add_header 'Access-Control-Allow-Credentials' 'true' always;
            add_header 'Access-Control-Max-Age' '2592000' always;
            add_header 'X-Cache-Status' $upstream_cache_status always;

            # Handle preflight
            if ($request_method = 'OPTIONS') {
                return 204;
            }

            # Proxy settings
            proxy_pass <your RPC URL>;
            proxy_http_version 1.1;
            proxy_set_header Host base-mainnet.g.alchemy.com;
            proxy_set_header Content-Type 'application/json';
            proxy_set_header Origin '';
            proxy_set_header Referer '';
            proxy_set_header User-Agent '';
            
            # Cache settings
            proxy_cache rpc_cache;
            proxy_cache_methods POST;
            proxy_cache_key "$request_body";
            proxy_cache_valid 200 22s;
            
            # Cache control
            set $no_eth_call 1;
            if ($request_body ~ "eth_call") {
                set $no_eth_call 0;
            }
            proxy_cache_bypass $http_cache_bypass;
            proxy_no_cache $no_eth_call;
        }
    }
}