如何使用golang lego让nginx后面的客户端加密？(How to use golang lego let's encrypt client behind nginx?)

You need to add in :80 and :443 virtual servers following location:

# http and https nginx servers
location /.well-known/acme-challenge/ {
    proxy_set_header Host $host;
    proxy_pass http://127.0.0.1:4000$request_uri;
}

And run lego binary:

./lego.amd64 --http 127.0.0.1:4000 --email="your@address.tld" --domains domain.tld --domains some.domain.tld run

Your certificate files stored in:

# ls -la .lego/certificates/
total 20
drwx------ 2 root root 4096 Nov  9 08:06 .
drwx------ 4 root root 4096 Nov  9 08:06 ..
-rw------- 1 root root 3477 Nov  9 08:15 domain.tld.crt
-rw------- 1 root root  226 Nov  9 08:15 domain.tld.json
-rw------- 1 root root 1679 Nov  9 08:15 domain.tld.key

tls-sni-01

./lego.amd64 --exclude=tls-sni-01  --http 127.0.0.1:4000  --email="your@address.com" --domains domain.tld --domains new.domain.tld run