RubyGems NO_PROXY auto-detection without http_configuration gem

rubygems-1.8.5-no_proxy.patch

--- rubygems-1.8.5/lib/rubygems/remote_fetcher.rb.orig	2011-07-20 00:28:13.000000000 +0900
+++ rubygems-1.8.5/lib/rubygems/remote_fetcher.rb	2011-07-20 01:09:59.000000000 +0900
@@ -69,6 +69,7 @@
       when URI::HTTP then proxy
       else URI.parse(proxy)
       end
+    @no_proxy = (ENV['NO_PROXY'] || ENV['no_proxy'] || 'localhost, 127.0.0.1').split(/\s*,\s*/)
     @user_agent = user_agent
   end
 
@@ -296,10 +297,17 @@
   # Creates or an HTTP connection based on +uri+, or retrieves an existing
   # connection, using a proxy if needed.
 
+  def out_of_no_proxy?(uri)
+    @no_proxy.each do |host_addr|
+      return false if uri.host.match(Regexp.quote(host_addr) + '$')
+    end
+    return true
+  end
+
   def connection_for(uri)
     net_http_args = [uri.host, uri.port]
 
-    if @proxy_uri then
+    if @proxy_uri and out_of_no_proxy?(uri) then
       net_http_args += [
         @proxy_uri.host,
         @proxy_uri.port,