"The page isn’t redirecting properly" when runn

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6

Ok, so now I’ve got this:

cloud.{$DOMAIN} {
    reverse_proxy nextcloud:443 {
        transport http {
             tls_insecure_skip_verify
        }
    }
}

But I’m still getting a white screen, and the Caddy logs say:

{"level":"error","ts":1589820896.1618576,"logger":"http.log.error","msg":"tls: first record does not look like a TLS handshake","request":{"method":"GET","uri":"/status.php","proto":"HTTP/1.1","remote_addr":"192.168.50.1:34210","host":"cloud.haddock.cc","headers":{"User-Agent":["Mozilla/5.0 (Linux) mirall/2.6.4git (Nextcloud)"],"Accept":["*/*"],"X-Request-Id":["f4842097-4648-499e-a7dc-3ee08298abec"],"Connection":["Keep-Alive"],"Accept-Encoding":["gzip, deflate"],"Accept-Language":["en-US,*"]},"tls":{"resumed":false,"version":772,"ciphersuite":4865,"proto":"","proto_mutual":true,"server_name":"cloud.haddock.cc"}},"duration":0.001318633,"status":502,"err_id":"1dq4z2f2v","err_trace":"reverseproxy.(*Handler).ServeHTTP (reverseproxy.go:380)"}

How do I turn on the debug global option?