Using Twilio/XML without Rails - ruby

Question

I am attempting to write a Twilio script to do voice broadcasting without rails - I would like to be able to run the script straight from my terminal.
I have a very simple script, straight from the twilio-rb gem docs:
# This should be in an initializer or similar
Twilio::Config.setup \
:account_sid => account,
:auth_token => token
Twilio::Call.create :to => '[phone]', :from => '+0987654321',
:url => xml_file
xml_file is a xml file on my local machine, but it throws this error:
Error #21205: Url is not a valid url
How can I write the above script to operate off of a local xml file? The end goal is strictly to make a phone call, play an audio message, gather a button press and do an action based on the number received. The Twiml XML file should do that for me, if I can get it to work.
EDIT:
When using the dropbox share link, I get this error within the Twilio interface:
'Twilio is unable to process the Content-Type of the provided URL. Please see the Twilio Markup XML Documentation for more information on valid Content-Types.
You must return a Content-Type for all requests. Requests without a Content-Type will appear in the Debugger as a 502 Bad Gateway error.
Having a phone number, outgoing call request or action attribute refer to a non XML or audio resource.
Having a Play verb attempt to play non-audio content, such as XML or text.
Verify that that your web server is returning a Content-Type and it is the expected value
Make sure the URL noted refers to a valid resource'
To make sure, I copied an example I know will work into my XML file:
<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Say voice="man">Hey man! Listen to this!</Say>
<Play>http://foo.com/cowbell.mp3</Play>
<Say voice="man">What did you think of that?!</Say>
<Record action="http://foo.com/handleRecording.php" method="GET" maxLength="20" finishOnKey="*"/>
<Gather action="/process_gather.php" method="GET">
<Say>Now hit some buttons!</Say>
</Gather>
<Say voice="man">Awesome! Thanks!</Say>
<Hangup/>
</Response>

Answer 1

Two ideas to try:
(1) If the file is read locally and sent to the Twilio server, try:
:url => 'file:///path/file.xml'
where
host in //host/ is omitted, yielding three slashes in a row.
path is the full filesystem path to your XML file.
file.xml is the name of your XML file.
(2) If the file must be publicly readable by the Twilio server, try placing it in the cloud somewhere (such as Dropbox) and using the public URL to it there.