因此，我有我的网站可用文件设置如下：

location / {
    proxy_pass http://localhost:3000/;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
}
location /legacy/ {
    proxy_pass https://my.domain.com/;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host https://my.domain.com/;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_cache_bypass $http_upgrade;
 }

然而，每当我去my.domain.com/leagcy/，我得到一个400错误直接返回，没有重定向或代理发生。任何想法，我做错了什么？