313390在签发acme证书时报错Challenge error -

    your_domain:Challenge error: <html>
    <head><title>502 Bad Gateway</title></head>
    <body>
    <center><h1>502 Bad Gateway</h1></center>
    <hr><center>nginx</center>
    </body>
    </html>
    [Mon Dec 18 10:34:38 AM CST 2023] Please add '--debug' or '--log' to check more details.
    [Mon Dec 18 10:34:38 AM CST 2023] See: https://github.com/acmesh-official/acme.sh/wiki/How-to-debug-acme.sh

在签发证书前执行：

    /root/.acme.sh/acme.sh --set-default -ca --server letsencrypt

再执行：

    /root/.acme.sh/acme.sh  --issue  --standalone  -d shop.313390.xyz