# Include WEBrick class with require
require 'webrick'

# FileHandler servlet provides the option to choose which files from user to serve
# The following code shows how to serve them from the folder 'myapp'
root = File.expand_path '/var/myapp/'

# Instantiating a new server with HTTPServer.new on port 1234 serving the documents from root folder
server = WEBrick::HTTPServer.new :Port => 1234, :DocumentRoot => root

# The following proc is used to customize the server operations
server.mount_proc '/' do |request, response|
  response.body = 'Hello, world!'
end

# The following command will provide a hook to shut down the server (often done with Ctrl+C)
trap('INT') {server.shutdown}

# Start the server
server.start

#Creating a virtual host that doesn't listen
vhost = WEBrick::HTTPServer.new :ServerName => 'vhost.example',
                                :DoNotListen => true, # ...

# Mounting the virtual host created above similar to the way HTTP server was mounted
vhost.mount '/', ...

# This host, when mounted to the listening server host, will now act as a virtual host
server.virtual_host vhost

# In addition to webrick, we will require webrick/https too for SSL functionalities
require 'webrick'
require 'webrick/https'

# Providing certificate name. This, however, will be a self-generated self-signed certificate
cert_name = [%w[CN localhost],]

# Enabling SSL and providing the certificate name will instantiate HTTPS server
server = WEBrick::HTTPServer.new(:Port => 1234,
                                 :SSLEnable => true,
                                 :SSLCertName => cert_name)

# In addition to the above two, we'll need openssl to read SSL certificates and keys
require 'openssl'

# Read the saved certificate and its signature key from the local directory
cert = OpenSSL::X509::Certificate.new File.read '/var/myapp/cert.pem'
pkey = OpenSSL::PKey::RSA.new File.read '/var/myapp/pkey.pem'

# Pass the certificate and the key as separate parameters while instantiating with HTTPServer.new
server = WEBrick::HTTPServer.new(:Port => 1234,
                                 :SSLEnable => true,
                                 :SSLCertificate => cert,
                                 :SSLPrivateKey => pkey)

# Instantiating a proxy server is similar, except that it is handled by HTTPProxyServer servlet
require 'webrick/httpproxy'
proxy = WEBrick::HTTPProxyServer.new :Port => 1234

# Providing the hook out from the current thread
trap 'INT' do proxy.shutdown end