fix nginx config

close #4347

docker/nginx.conf

@@ -16,7 +16,6 @@ server {
     location /api {
         proxy_pass https://preview.pro.ant.design;
         proxy_set_header   X-Forwarded-Proto $scheme;
-        proxy_set_header   Host              $http_host;
         proxy_set_header   X-Real-IP         $remote_addr;
     }
 }