GET with NSURLSession + Basic Auth in RubyMotion

nsurlsession_get_plus_basic_auth.rb

def session_with_basic_auth
  return @session_with_basic_auth if @session_with_basic_auth
  configuration = NSURLSessionConfiguration.defaultSessionConfiguration.tap do |conf|
    any_username_will_do = 'xxx'
    userPasswordString = "#{any_username_will_do}: #{api_key}"
    userPasswordData = userPasswordString.dataUsingEncoding(NSUTF8StringEncoding)
    base64EncodedCredential = userPasswordData.base64EncodedStringWithOptions(0)
    authString = "Basic #{base64EncodedCredential}"
    #TODO test error handling when authorization is invalid, or when URL is wrong
    conf.HTTPAdditionalHeaders = {'Accept'=>'application/json',
                                  'Accept-Language'=>'en',
                                  'Authorization'=> authString,
                                  'User-Agent'=> user_agent}
  end
  @session_with_basic_auth = NSURLSession.sessionWithConfiguration(configuration)
  @session_with_basic_auth.delegate = self
  @session_with_basic_auth
end

def get_example(aURLString, &block)
  task = session_with_basic_auth.downloadTaskWithURL(NSURL.URLWithString("#{url_prefix_v3}#{aURLString}"), completionHandler: proc {|data_url, response, error|
    data = NSData.dataWithContentsOfURL(data_url)
    handle_api_result(data, error, &block)
  })
  task.resume
end