Hello there. First of all, you can access the REST Countries API directly, without mashape. And you also can use Python Requests library http://docs.python-requests.org/en/latest/

This way you wouldn’t need any headers. So, for example, a simple GET request would look like this:
<pre><code>

-- coding: utf-8 --

import requests

r = requests.get(‘https://restcountries.eu/rest/v1/name/colombia’)
print(r.text.encode(‘utf-8’))
</code></pre>

You can see all the available endpoints at: https://restcountries.eu

I hope this is useful