util.rb in stripe-1.28.0

- old
+ new

@@ -1,5 +1,7 @@
+require "webrick"
+
 module Stripe
   module Util
     def self.objects_to_ids(h)
       case h
       when APIResource
@@ -91,10 +93,13 @@
         object
       end
     end
 
     def self.url_encode(key)
-      URI.escape(key.to_s, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]"))
+      # Unfortunately, URI.escape was deprecated. Here we use a method from
+      # WEBrick instead given that it's a fairly close approximation (credit to
+      # the AWS Ruby SDK for coming up with the technique).
+      WEBrick::HTTPUtils.escape(key.to_s).gsub('%5B', '[').gsub('%5D', ']')
     end
 
     def self.flatten_params(params, parent_key=nil)
       result = []
       params.each do |key, value|