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---
title: OpenBSD relayd/httpd web server example
date: 2021-02-10
description: a detailed answer to a question on reddit
tags:
- OpenBSD
---
## Introduction
[Someone on reddit had trouble](https://www.reddit.com/r/openbsd/comments/lh4yl9/relaydhttpd_reverse_proxy_for_synapse_with/) with how `relayd` and `httpd` work together on OpenBSD. Those are two great components of the OpenBSD base system that take a different approach than the traditional web servers like `Nginx` or `Apache`. I wrote an answer with a complete example adapted from my own working configurations.
The goal was to have a relayd configuration that would serve urls like `https://example.com/` with the static website content from httpd, and proxy traffic to urls like https://chat.example.com/ to a synapse server running on `localhost:8008`. Hopefully my working example can provide a better understanding of the idea behind the couple relayd/httpd.
## The httpd configuration
```nginx
prefork 5
server "example.com" {
alias "chat.example.com"
listen on * port 80
location "/.well-known/acme-challenge/*" {
root "/acme"
request strip 2
}
location * {
block return 301 "https://$HTTP_HOST$REQUEST_URI"
}
}
server "example.com" {
listen on * port 8080
location * {
root "/htdocs/www/public/"
}
}
```
## The relayd configuration
```cfg
log state changes
log connection errors
prefork 5
table <httpd> { 127.0.0.1 }
table <synapse> { 127.0.0.1 }
http protocol "wwwsecure" {
tls keypair "example.com"
tls keypair "chat.example.com"
# Return HTTP/HTML error pages to the client
return error
# you may want to remove this depending on your use case
#match request header set "Connection" value "close"
# your web application might need these headers
match request header set "X-Forwarded-For" value "$REMOTE_ADDR"
match request header set "X-Forwarded-By" value "$SERVER_ADDR:$SERVER_PORT"
# set best practice security headers
# use https://securityheaders.com to check
# and modify as needed
match response header remove "Server"
match response header append "Strict-Transport-Security" value "max-age=31536000; includeSubDomains"
match response header append "X-Frame-Options" value "SAMEORIGIN"
match response header append "X-XSS-Protection" value "1; mode=block"
match response header append "X-Content-Type-Options" value "nosniff"
match response header append "Referrer-Policy" value "strict-origin"
match response header append "Content-Security-Policy" value "default-src https:; style-src 'self' \
'unsafe-inline'; font-src 'self' data:; script-src 'self' 'unsafe-inline' 'unsafe-eval'"
match response header append "Permissions-Policy" value "accelerometer=(none), camera=(none), \
geolocation=(none), gyroscope=(none), magnetometer=(none), microphone=(none), payment=(none), usb=(none)"
# set recommended tcp options
tcp { nodelay, sack, socket buffer 65536, backlog 100 }
pass request quick header "Host" value "example.com" forward to <httpd>
pass request quick header "Host" value "chat.example.com" forward to <synapse>
}
relay "wwwsecure" {
listen on 0.0.0.0 port 443 tls
protocol wwwsecure
forward to <httpd> port 8080
forward to <synapse> port 8008
}
relay "wwwsecure6" {
listen on :: port 443 tls
protocol wwwsecure
forward to <httpd> port 8080
forward to <synapse> port 8008
}
```
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