upstream vault       { server 127.0.0.1:8200 }
upstream vault_usage { server 127.0.0.1:3000 }

server {
    location / {
        proxy_pass http://vault;
    }
    location /v1/ {
        proxy_pass http://vault;
        mirror /mirror-vault-usage;
        mirror_request_body off;
    }
    location = /mirror-vault-usage {
        internal;
        proxy_pass http://vault_usage;
        proxy_pass_request_body off;
        proxy_set_header Content-Length "";
        proxy_set_header X-Vault-Token "";
        proxy_http_version 1.1;
    }
}