Plugin crashes caddy 0.10.4 builds about caddy-grpc HOT 2 OPEN

Hi @klingtnet,

It seems the problem is there's another plugin that uses grpc and https://github.com/grpc/grpc-go/blob/master/trace.go imports golang.org/x/net/trace which in turn registers /debug/requests and /debug/events handlers in it's init() function to the Go default http muxer.
(https://github.com/golang/net/blob/master/trace/trace.go#L112-L117)

I'm not sure yet if it will be possible to fix it from within my plugin as the problem is deeply entrenched in the grpc package.

I've established that it's the dns server type that's also using grpc, so a temporary solution would be to exclude the other plugin if you want to use one of them(exclude dns if you want to use grpc or vice versa ). Obviously this is not ideal if you want to use both plugins.
I have tested it by excluding dns plugin as follows:

curl -Lsf 'https://caddyserver.com/download/linux/amd64?plugins=http.authz,http.awslambda,http.cgi,http.cors,http.datadog,http.expires,http.filemanager,http.filter,http.git,http.gopkg,http.grpc,http.hugo,http.ipfilter,http.jwt,http.login,http.mailout,http.minify,http.prometheus,http.proxyprotocol,http.ratelimit,http.realip,http.reauth,http.upload,net,tls.dns.cloudflare,tls.dns.digitalocean,tls.dns.dnsimple,tls.dns.dnspod,tls.dns.dyn,tls.dns.exoscale,tls.dns.gandi,tls.dns.googlecloud,tls.dns.linode,tls.dns.namecheap,tls.dns.ovh,tls.dns.rackspace,tls.dns.rfc2136,tls.dns.route53,tls.dns.vultr' | tar -xvz caddy && ./caddy

Pieter

from caddy-grpc.

If I add all the plugins as well as github.com/pieterlouw/caddy-grpc,

panic: /debug/requests is already registered. You may have two independent copies of golang.org/x/net/trace in your binary, trying to maintain separate state. This may involve a vendored copy of golang.org/x/net/trace.

from caddy-grpc.