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# Using a Reverse Proxy with HedgeDoc
If you want to use a reverse proxy to serve HedgeDoc, here are the essential
configs that you'll have to do.
This documentation will cover HTTPS setup, with comments for HTTP setup.
## HedgeDoc config
[Full explanation of the configuration options](../configuration.md)
| `config.json` parameter | Environment variable | Value | Example |
|-------------------------|----------------------|-------|---------|
| `domain` | `CMD_DOMAIN` | The full domain where your instance will be available | `hedgedoc.example.com` |
| `host` | `CMD_HOST` | An ip or domain name that is only available to HedgeDoc and your reverse proxy | `localhost` |
| `port` | `CMD_PORT` | An available port number on that IP | `3000` |
| `path` | `CMD_PATH` | path to UNIX domain socket to listen on (if specified, `host` or `CMD_HOST` and `port` or `CMD_PORT` are ignored) | `/var/run/hedgedoc.sock` |
| `protocolUseSSL` | `CMD_PROTOCOL_USESSL` | `true` if you want to serve your instance over SSL (HTTPS), `false` if you want to use plain HTTP | `true` |
| `useSSL` | | `false`, the communications between HedgeDoc and the proxy are unencrypted | `false` |
| `urlAddPort` | `CMD_URL_ADDPORT` | `false`, HedgeDoc should not append its port to the URLs it links | `false` |
| `hsts.enable` | `CMD_HSTS_ENABLE` | `true` if you host over SSL, `false` otherwise | `true` |
## Reverse Proxy config
### Generic
The reverse proxy must allow websocket `Upgrade` requests at path `/sockets.io/`.
It must pass through the scheme used by the client (http or https).
### Nginx
Here is an example configuration for Nginx.
```
map $http_upgrade $connection_upgrade {
default upgrade;
'' close;
}
server {
server_name hedgedoc.example.com;
location / {
proxy_pass http://127.0.0.1:3000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
location /socket.io/ {
proxy_pass http://127.0.0.1:3000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
}
listen [::]:443 ssl http2;
listen 443 ssl http2;
ssl_certificate fullchain.pem;
ssl_certificate_key privkey.pem;
include options-ssl-nginx.conf;
ssl_dhparam ssl-dhparams.pem;
}
```
### Apache
You will need these modules enabled: `proxy`, `proxy_http` and `proxy_wstunnel`.
Here is an example config snippet:
```
<VirtualHost *:443>
ServerName hedgedoc.example.com
RewriteEngine on
RewriteCond %{REQUEST_URI} ^/socket.io [NC]
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /(.*) ws://127.0.0.1:3000/$1 [P,L]
ProxyPass / http://127.0.0.1:3000/
ProxyPassReverse / http://127.0.0.1:3000/
RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
SSLCertificateFile /etc/letsencrypt/live/hedgedoc.example.com/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/hedgedoc.example.com/privkey.pem
Include /etc/letsencrypt/options-ssl-apache.conf
</VirtualHost>
```
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