[NGINX] 求教关于反代的问题

之前部署了一个 Discourse 站点 部署在一台配置比较高但是线路没有优化的机器上 容器内部使用 nginx 然后通过 Unix Socket 使用宿主机的 Caddy 进行域名访问 之后我在线路比较好的香港服务器上部署 Nginx 对原站进行反代 但是反代后为502，无法正常访问 我看了下error.log说的是代理服务器和源站 ssl 握手失败 但是我在代理服务器里面写的是https，而且代理服务器curl能正常获取到内容 这个是源站的caddyfile

direct.example.com {
    reverse_proxy unix//var/discourse/shared/standalone/nginx.http.sock {
        header_up Host {host}
        header_up X-Real-IP {remote}
        header_up X-Forwarded-For {remote}
        header_up X-Forwarded-Proto {scheme}
    }
 header {
        Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
    }
}

synapse.know-cnu.wiki {
    reverse_proxy localhost:8008 {
        # WebSocket 连接的默认配置
        header_up Host {host}
        header_up X-Real-IP {remote}
        header_up X-Forwarded-For {remote}
        header_up X-Forwarded-Proto {scheme}

        # 处理 WebSocket 连接
        transport http {
            read_buffer 0
        }
    }

    # 设置 HSTS 头部
    header {
        Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
    }

这个是代理服务器的nginx.conf，未使用ssl

server {
    listen 80;
    server_name example.com;

    location / {
        proxy_pass https://direct.example.com;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

error.log如下

root@VM80459:~# tail -f /var/log/nginx/error.log
2024/08/24 06:08:57 [emerg] 3325#3325: "server" directive is not allowed here in /etc/nginx/nginx.conf:11
2024/08/24 06:09:05 [emerg] 3326#3326: "server" directive is not allowed here in /etc/nginx/nginx.conf:11
2024/08/24 06:10:18 [notice] 3373#3373: signal process started
2024/08/24 06:19:53 [notice] 3445#3445: signal process started
2024/08/24 06:20:02 [error] 3446#3446: *12 SSL_do_handshake() failed (SSL: error:0A000438:SSL routines::tlsv1 alert internal error:SSL alert number 80) while SSL handshaking to upstream, client: 1xx.1x.5x.xx, server: know-cnu.wiki, request: "GET / HTTP/1.1", upstream: "https://[2400:61xx:0:dx::xa:a0x]:443/", host: "example.com"
2024/08/24 06:20:02 [error] 3446#3446: *12 SSL_do_handshake() failed (SSL: error:0A000438:SSL routines::tlsv1 alert internal error:SSL alert number 80) while SSL handshaking to upstream, client: 10x.13x.5x.18x, server: example.com, request: "GET / HTTP/1.1", upstream: "https://15x.8x.2xx.xx:443/", host: "example.com"