Use URI.parser method, and remove 1.8.x code

actionpack/lib/action_dispatch/routing/redirection.rb

@@ -1,4 +1,5 @@
 require 'action_dispatch/http/request'
+require 'active_support/core_ext/uri'
 
 module ActionDispatch
   module Routing
@@ -13,7 +14,7 @@ def initialize(status, block)
       def call(env)
         req = Request.new(env)
 
-        uri = URI.parse(path(req.symbolized_path_parameters, req))
+        uri = URI.parser.parse(path(req.symbolized_path_parameters, req))
         uri.scheme ||= req.scheme
         uri.host   ||= req.host
         uri.port   ||= req.port unless req.standard_port?

activerecord/lib/active_record/connection_adapters/connection_specification.rb

@@ -1,3 +1,5 @@
+require 'active_support/core_ext/uri'
+
 module ActiveRecord
   module ConnectionAdapters
     class ConnectionSpecification #:nodoc:
@@ -61,7 +63,7 @@ def resolve_hash_connection(spec) # :nodoc:
         end
 
         def connection_url_to_hash(url) # :nodoc:
-          config = URI.parse url
+          config = URI.parser.parse url
           adapter = config.scheme
           adapter = "postgresql" if adapter == "postgres"
           spec = { :adapter  => adapter,

activesupport/lib/active_support/core_ext/uri.rb

@@ -20,7 +20,7 @@ def unescape(str, escaped = /%[a-fA-F\d]{2}/)
 module URI
   class << self
     def parser
-      @parser ||= URI.const_defined?(:Parser) ? URI::Parser.new : URI
+      @parser ||= URI::Parser.new
     end
   end
 end