vercel.json

{
 "github": {
 "silent": true
 },
 "headers": [
 {
 "source": "/(.*)",
 "headers": [
 {
 "key": "X-Real-IP",
 "value": "$remote_addr"
 },
 {
 "key": "X-Forwarded-For",
 "value": "$proxy_add_x_forwarded_for"
 },
 {
 "key": "Host",
 "value": "$http_host"
 }
 ]
 }
 ]
}