how to set root path reverse proxy by nginx

[v4if]

behind nginx with a sub path, how to set the resource root path with the sub path
such as: http://example.com/path/to/milvus

nginx config:

  location /path/to/milvus/ {
    proxy_pass http://11.132.42.228:30006;
    proxy_set_header Host $http_host;
  }

request the url：http://example.com/path/to/milvus，response the error：