typhoeus: add a cache store for successful requests

app/lib/typhoeus/cache/successful_requests_rails_cache.rb

@@ -0,0 +1,21 @@
+module Typhoeus
+  module Cache
+    # Cache successful Typhoeus requests in the Rails cache
+    # (but don’t cache failed requests).
+    #
+    # Usage:
+    #   Typhoeus.config.cache = Typhoeus::Cache::SuccessfulRequestsRailsCache.new
+    #   Typhoeus.get('http://exemple.com/api', cache_ttl: 1.day)
+    class SuccessfulRequestsRailsCache
+      def get(request)
+        ::Rails.cache.read(request)
+      end
+
+      def set(request, response)
+        if response&.success?
+          ::Rails.cache.write(request, response, expires_in: request.cache_ttl)
+        end
+      end
+    end
+  end
+end