1. The problem I’m having:
Hey Everyone! I’m trying to configure Caddy to be a load balancer for multiple solana nodes I’m using (if you know what that is). Configuration seems valid and it works 95% of the time, but sometimes the Caddy fails. I’m not sure what the reason for that is, I’m assuming that Batch Reqests (around 200-300 simultanious req) that I sometimes send have something to do with it. I’d be really glad if somebody can help me out, I don’t want to go back to Nginx 
2. Error messages and/or full log output:
Feb 11 10:45:31 hetzner-cloud-test caddy[905]: {"level":"error","ts":1739270731.0617454,"logger":"http.log.error.log0","msg":"http2: Transport: cannot retry err [http2: Transport received Server's graceful shutdown GOAWAY] after Request.Body was written; define Request.GetBody to avoid this error","request":{"remote_ip":"<private>","remote_port":"54450","client_ip":"<private>","proto":"HTTP/1.1","method":"POST","host":"example.com","uri":"/","headers":{"Content-Type":["application/json"],"Solana-Client":["js/1.0.0-maintenance"],"Connection":["keep-alive"],"User-Agent":["Bun/1.2.2"],"Accept":["*/*"],"Accept-Encoding":["gzip, deflate, br"],"Content-Length":["168"]},"tls":{"resumed":false,"version":772,"cipher_suite":4865,"proto":"http/1.1","server_name":"example.com"}},"duration":0.004944987,"status":502,"err_id":"fp93xhb76","err_trace":"reverseproxy.statusError (reverseproxy.go:1373)"}
3. Caddy version:
v2.9.1
4. How I installed and ran Caddy:
sudo apt install -y debian-keyring debian-archive-keyring apt-transport-https curl
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' | sudo gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' | sudo tee /etc/apt/sources.list.d/caddy-stable.list
sudo apt update
sudo apt install caddy
a. System environment:
Distributor ID: Ubuntu
Description: Ubuntu 24.04.1 LTS
Release: 24.04
Codename: noble
systemd 255 (255.4-1ubuntu8.5)
b. Command:
I’m not sure what do I need to state here. I run caddy.service unit file via systemctl
d. My complete Caddy config:
example.com {
log {
output stdout
format console {
time_format common_log
time_local
}
level WARN
}
# First enforce IP whitelist for ALL requests
@allowed_ips remote_ip 127.0.0.1 # REPLACE WITH YOUR IPS
handle @allowed_ips {
# Protected reverse proxy configuration
rewrite ?api-key=<private>
reverse_proxy https://mainnet.helius-rpc.com https://rpc.shyft.to {
header_up Host {upstream_hostport}
header_down X-Backend-Host {upstream_hostport}
lb_policy least_conn
transport http {
tls
}
}
}
# Block all non-whitelisted IPs
handle {
respond "Access denied" 403
}
}