Proxy API request through your server to avoid cross–origin issues.

api_proxy.rb

# USAGE:
# 
# Mount endpoint, e.g.:
#
# map '/api_proxy' do
#  run APIProxy.new
# end
# 
# Then call the endpoint, passing the actual URL
# as GET param `api_url`
# 
class APIProxy

  def call(env)
    request = Rack::Request.new(env)
    api_url = request.params['api_url']

    [200, { 'Content-Type' => 'application/json' }, [get_json(api_url)]]
  end

  private

  def get_json(url)
    uri      = URI.parse(URI::unescape(url))
    response = Net::HTTP.get(uri)

    response
  end

end