add 3rd party API proxy example

Author: subelsky

examples/api_proxy.rb

@@ -0,0 +1,28 @@
+#!/usr/bin/env ruby
+
+# Rewrites and proxies requests to a third-party API, with HTTP basic authentication.
+
+require'goliath'
+require'em-synchrony/em-http'
+
+classTwilioResponse < Goliath::API
+useGoliath::Rack::Params
+useGoliath::Rack::JSONP
+
+HEADERS={authorization: ENV.values_at("TWILIO_SID","TWILIO_AUTH_TOKEN")}
+BASE_URL="https://api.twilio.com/2010-04-01/Accounts/#{ENV['TWILIO_SID']}/AvailablePhoneNumbers/US"
+
+defresponse(env)
+url="#{BASE_URL}#{env['REQUEST_PATH']}?#{env['QUERY_STRING']}"
+logger.debug"Proxying #{url}"
+
+http=EM::HttpRequest.new(url).gethead: HEADERS
+logger.debug"Received #{http.response_header.status} from Twilio"
+
+[200,{'X-Goliath'=>'Proxy','Content-Type'=>'application/javascript'},http.response]
+end
+end
+
+classTwilio < Goliath::API
+get%r{^/(Local|TollFree)},TwilioResponse
+end