send/docs/deployment.md

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## Requirements
This document describes how to do a full deployment of Send on your own Linux server. You will need:
* A working (and ideally somewhat recent) installation of NodeJS and NPM
* GIT
* An Apache webserver
* Optionally telnet, to be able to quickly check your installation
For Debian/Ubuntu systems this probably just means something like this:
* apt install git apache2 nodejs npm telnet
## Building
* We assume an already configured virtual-host on your webserver with an existing empty htdocs folder
* First, remove that htdocs folder - we will replace it with Send's version now
* git clone https://github.com/mozilla/send.git htdocs
* Make now sure you are NOT root but rather the user your webserver is serving files under (e.g. "su www-data" or whoever the owner of your htdocs folder is)
* npm install
* npm run build
## Running
To have a permanently running version of Send as a background process:
* Create a file "run.sh" with:
```
#!/bin/bash
nohup su www-data -c "npm run prod" 2>/dev/null &
```
* chmod +x run.sh
* ./run.sh
Now the Send backend should be running on port 1443. You can check with:
* telnet localhost 1443
## Reverse Proxy
Of course, we don't want to expose the service on port 1443. Instead we want our normal webserver to forward all requests to Send ("Reverse proxy").
# Apache webserver
* a2enmod proxy
* a2enmod proxy_http
* a2enmod proxy_wstunnel
In your Apache virtual host configuration file, insert this:
```
# Enable rewrite engine
RewriteEngine on
# Make sure the original domain name is forwarded to Send
# Otherwise the generated URLs will be wrong
ProxyPreserveHost on
# Make sure the generated URL is https://
RequestHeader set X-Forwarded-Proto https
# If it's a normal file (e.g. PNG, CSS) just return it
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule .* - [L]
# If it's a websocket connection, redirect it to a Send WS connection
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule /(.*) ws://127.0.0.1:1443/$1 [P,L]
# Otherwise redirect it to a normal HTTP connection
RewriteRule ^/(.*)$ http://127.0.0.1:1443/$1 [P,QSA]
ProxyPassReverse "/" "http://127.0.0.1:1443"
```