C:\work\opensource\ruby\rubygems>C:\Progra~1\Subversion\bin\svn.exe di 
Index: lib/rubygems/remote_fetcher.rb
===================================================================
--- lib/rubygems/remote_fetcher.rb	(revision 1201)
+++ lib/rubygems/remote_fetcher.rb	(working copy)
@@ -116,14 +116,19 @@
   # Read the data from the (source based) URI, but if it is a file:// URI,
   # read from the filesystem instead.
   def open_uri_or_path(uri, &block)
-    require 'open-uri'
+    require 'rubygems/open-uri'
     if file_uri?(uri)
       open(get_file_uri_path(uri), &block)
     else
       connection_options = {
-        "User-Agent" => "RubyGems/#{Gem::RubyGemsVersion}",
-        :proxy => @proxy_uri,
+        "User-Agent" => "RubyGems/#{Gem::RubyGemsVersion}"
       }
+
+      if @proxy_uri
+        http_proxy_url = "#{@proxy_uri.scheme}://#{@proxy_uri.host}:#{@proxy_uri.port}"  
+        connection_options[:proxy_http_basic_authentication] = [http_proxy_url, unescape(@proxy_uri.user)||'', unescape(@proxy_uri.password)||'']
+      end
+
       open(uri, connection_options, &block)
     end
   end
Index: lib/rubygems/open-uri.rb
===================================================================
--- lib/rubygems/open-uri.rb	(revision 0)
+++ lib/rubygems/open-uri.rb	(revision 0)
@@ -0,0 +1,771 @@
+require 'uri'
+require 'stringio'
+require 'time'
+
+module Kernel
+  private
+  alias open_uri_original_open open # :nodoc:
+
+  # makes possible to open various resources including URIs.
+  # If the first argument respond to `open' method,
+  # the method is called with the rest arguments.
+  #
+  # If the first argument is a string which begins with xxx://,
+  # it is parsed by URI.parse.  If the parsed object respond to `open' method,
+  # the method is called with the rest arguments.
+  #
+  # Otherwise original open is called.
+  #
+  # Since open-uri.rb provides URI::HTTP#open, URI::HTTPS#open and
+  # URI::FTP#open,
+  # Kernel[#.]open can accepts such URIs and strings which begins with
+  # http://, https:// and ftp://.
+  # In these case, the opened file object is extended by OpenURI::Meta.
+  def open(name, *rest, &block) # :doc:
+    if name.respond_to?(:open)
+      name.open(*rest, &block)
+    elsif name.respond_to?(:to_str) &&
+          %r{\A[A-Za-z][A-Za-z0-9+\-\.]*://} =~ name &&
+          (uri = URI.parse(name)).respond_to?(:open)
+      uri.open(*rest, &block)
+    else
+      open_uri_original_open(name, *rest, &block)
+    end
+  end
+  module_function :open
+end
+
+# OpenURI is an easy-to-use wrapper for net/http, net/https and net/ftp.
+#
+#== Example
+#
+# It is possible to open http/https/ftp URL as usual like opening a file:
+#
+#   open("http://www.ruby-lang.org/") {|f|
+#     f.each_line {|line| p line}
+#   }
+#
+# The opened file has several methods for meta information as follows since
+# it is extended by OpenURI::Meta.
+#
+#   open("http://www.ruby-lang.org/en") {|f|
+#     f.each_line {|line| p line}
+#     p f.base_uri         # <URI::HTTP:0x40e6ef2 URL:http://www.ruby-lang.org/en/>
+#     p f.content_type     # "text/html"
+#     p f.charset          # "iso-8859-1"
+#     p f.content_encoding # []
+#     p f.last_modified    # Thu Dec 05 02:45:02 UTC 2002
+#   }
+#
+# Additional header fields can be specified by an optional hash argument.
+#
+#   open("http://www.ruby-lang.org/en/",
+#     "User-Agent" => "Ruby/#{RUBY_VERSION}",
+#     "From" => "foo@bar.invalid",
+#     "Referer" => "http://www.ruby-lang.org/") {|f|
+#     # ...
+#   }
+#
+# The environment variables such as http_proxy, https_proxy and ftp_proxy
+# are in effect by default.  :proxy => nil disables proxy.
+#
+#   open("http://www.ruby-lang.org/en/raa.html", :proxy => nil) {|f|
+#     # ...
+#   }
+#
+# URI objects can be opened in a similar way.
+#
+#   uri = URI.parse("http://www.ruby-lang.org/en/")
+#   uri.open {|f|
+#     # ...
+#   }
+#
+# URI objects can be read directly. The returned string is also extended by
+# OpenURI::Meta.
+#
+#   str = uri.read
+#   p str.base_uri
+#
+# Author:: Tanaka Akira <akr@m17n.org>
+
+module OpenURI
+  Options = {
+    :proxy => true,
+    :proxy_http_basic_authentication => true,
+    :progress_proc => true,
+    :content_length_proc => true,
+    :http_basic_authentication => true,
+    :read_timeout => true,
+    :ssl_ca_cert => nil,
+    :ssl_verify_mode => nil,
+  }
+
+  def OpenURI.check_options(options) # :nodoc:
+    options.each {|k, v|
+      next unless Symbol === k
+      unless Options.include? k
+        raise ArgumentError, "unrecognized option: #{k}"
+      end
+    }
+  end
+
+  def OpenURI.scan_open_optional_arguments(*rest) # :nodoc:
+    if !rest.empty? && (String === rest.first || Integer === rest.first)
+      mode = rest.shift
+      if !rest.empty? && Integer === rest.first
+        perm = rest.shift
+      end
+    end
+    return mode, perm, rest
+  end
+
+  def OpenURI.open_uri(name, *rest) # :nodoc:
+    uri = URI::Generic === name ? name : URI.parse(name)
+    mode, perm, rest = OpenURI.scan_open_optional_arguments(*rest)
+    options = rest.shift if !rest.empty? && Hash === rest.first
+    raise ArgumentError.new("extra arguments") if !rest.empty?
+    options ||= {}
+    OpenURI.check_options(options)
+
+    unless mode == nil ||
+           mode == 'r' || mode == 'rb' ||
+           mode == File::RDONLY
+      raise ArgumentError.new("invalid access mode #{mode} (#{uri.class} resource is read only.)")
+    end
+
+    io = open_loop(uri, options)
+    if block_given?
+      begin
+        yield io
+      ensure
+        io.close
+      end
+    else
+      io
+    end
+  end
+
+  def OpenURI.open_loop(uri, options) # :nodoc:
+    proxy_opts = []
+    proxy_opts << :proxy_http_basic_authentication if options.include? :proxy_http_basic_authentication
+    proxy_opts << :proxy if options.include? :proxy
+    proxy_opts.compact!
+    if 1 < proxy_opts.length
+      raise ArgumentError, "multiple proxy options specified"
+    end
+    case proxy_opts.first
+    when :proxy_http_basic_authentication
+      opt_proxy, proxy_user, proxy_pass = options.fetch(:proxy_http_basic_authentication)
+      proxy_user = proxy_user.to_str
+      proxy_pass = proxy_pass.to_str
+      if opt_proxy == true
+        raise ArgumentError.new("Invalid authenticated proxy option: #{options[:proxy_http_basic_authentication].inspect}")
+      end
+    when :proxy
+      opt_proxy = options.fetch(:proxy)
+      proxy_user = nil
+      proxy_pass = nil
+    when nil
+      opt_proxy = true
+      proxy_user = nil
+      proxy_pass = nil
+    end
+    case opt_proxy
+    when true
+      find_proxy = lambda {|u| pxy = u.find_proxy; pxy ? [pxy, nil, nil] : nil}
+    when nil, false
+      find_proxy = lambda {|u| nil}
+    when String
+      opt_proxy = URI.parse(opt_proxy)
+      find_proxy = lambda {|u| [opt_proxy, proxy_user, proxy_pass]}
+    when URI::Generic
+      find_proxy = lambda {|u| [opt_proxy, proxy_user, proxy_pass]}
+    else
+      raise ArgumentError.new("Invalid proxy option: #{opt_proxy}")
+    end
+
+    uri_set = {}
+    buf = nil
+    while true
+      redirect = catch(:open_uri_redirect) {
+        buf = Buffer.new
+        uri.buffer_open(buf, find_proxy.call(uri), options)
+        nil
+      }
+      if redirect
+        if redirect.relative?
+          # Although it violates RFC2616, Location: field may have relative
+          # URI.  It is converted to absolute URI using uri as a base URI.
+          redirect = uri + redirect
+        end
+        unless OpenURI.redirectable?(uri, redirect)
+          raise "redirection forbidden: #{uri} -> #{redirect}"
+        end
+        if options.include? :http_basic_authentication
+          # send authentication only for the URI directly specified.
+          options = options.dup
+          options.delete :http_basic_authentication
+        end
+        uri = redirect
+        raise "HTTP redirection loop: #{uri}" if uri_set.include? uri.to_s
+        uri_set[uri.to_s] = true
+      else
+        break
+      end
+    end
+    io = buf.io
+    io.base_uri = uri
+    io
+  end
+
+  def OpenURI.redirectable?(uri1, uri2) # :nodoc:
+    # This test is intended to forbid a redirection from http://... to
+    # file:///etc/passwd.
+    # However this is ad hoc.  It should be extensible/configurable.
+    uri1.scheme.downcase == uri2.scheme.downcase ||
+    (/\A(?:http|ftp)\z/i =~ uri1.scheme && /\A(?:http|ftp)\z/i =~ uri2.scheme)
+  end
+
+  def OpenURI.open_http(buf, target, proxy, options) # :nodoc:
+    if proxy
+      proxy_uri, proxy_user, proxy_pass = proxy
+      raise "Non-HTTP proxy URI: #{proxy_uri}" if proxy_uri.class != URI::HTTP
+    end
+
+    if target.userinfo && "1.9.0" <= RUBY_VERSION
+      # don't raise for 1.8 because compatibility.
+      raise ArgumentError, "userinfo not supported.  [RFC3986]"
+    end
+
+    header = {}
+    options.each {|k, v| header[k] = v if String === k }
+
+    require 'net/http'
+    klass = Net::HTTP
+    if URI::HTTP === target
+      # HTTP or HTTPS
+      if proxy
+        if proxy_user && proxy_pass
+          klass = Net::HTTP::Proxy(proxy_uri.host, proxy_uri.port, proxy_user, proxy_pass)
+        else
+          klass = Net::HTTP::Proxy(proxy_uri.host, proxy_uri.port)
+        end
+      end
+      target_host = target.host
+      target_port = target.port
+      request_uri = target.request_uri
+    else
+      # FTP over HTTP proxy
+      target_host = proxy_uri.host
+      target_port = proxy_uri.port
+      request_uri = target.to_s
+      if proxy_user && proxy_pass
+        header["Proxy-Authorization"] = 'Basic ' + ["#{proxy_user}:#{proxy_pass}"].pack('m').delete("\r\n")
+      end
+    end
+
+    http = klass.new(target_host, target_port)
+    if target.class == URI::HTTPS
+      require 'net/https'
+      http.use_ssl = true
+      http.verify_mode = options[:ssl_verify_mode] || OpenSSL::SSL::VERIFY_PEER
+      store = OpenSSL::X509::Store.new
+      if options[:ssl_ca_cert]
+        if File.directory? options[:ssl_ca_cert]
+          store.add_path options[:ssl_ca_cert]
+        else
+          store.add_file options[:ssl_ca_cert]
+        end
+      else
+        store.set_default_paths
+      end
+      store.set_default_paths
+      http.cert_store = store
+    end
+    if options.include? :read_timeout
+      http.read_timeout = options[:read_timeout]
+    end
+
+    resp = nil
+    http.start {
+      if target.class == URI::HTTPS
+        # xxx: information hiding violation
+        sock = http.instance_variable_get(:@socket)
+        if sock.respond_to?(:io)
+          sock = sock.io # 1.9
+        else
+          sock = sock.instance_variable_get(:@socket) # 1.8
+        end
+        sock.post_connection_check(target_host)
+      end
+      req = Net::HTTP::Get.new(request_uri, header)
+      if options.include? :http_basic_authentication
+        user, pass = options[:http_basic_authentication]
+        req.basic_auth user, pass
+      end
+      http.request(req) {|response|
+        resp = response
+        if options[:content_length_proc] && Net::HTTPSuccess === resp
+          if resp.key?('Content-Length')
+            options[:content_length_proc].call(resp['Content-Length'].to_i)
+          else
+            options[:content_length_proc].call(nil)
+          end
+        end
+        resp.read_body {|str|
+          buf << str
+          if options[:progress_proc] && Net::HTTPSuccess === resp
+            options[:progress_proc].call(buf.size)
+          end
+        }
+      }
+    }
+    io = buf.io
+    io.rewind
+    io.status = [resp.code, resp.message]
+    resp.each {|name,value| buf.io.meta_add_field name, value }
+    case resp
+    when Net::HTTPSuccess
+    when Net::HTTPMovedPermanently, # 301
+         Net::HTTPFound, # 302
+         Net::HTTPSeeOther, # 303
+         Net::HTTPTemporaryRedirect # 307
+      throw :open_uri_redirect, URI.parse(resp['location'])
+    else
+      raise OpenURI::HTTPError.new(io.status.join(' '), io)
+    end
+  end
+
+  class HTTPError < StandardError
+    def initialize(message, io)
+      super(message)
+      @io = io
+    end
+    attr_reader :io
+  end
+
+  class Buffer # :nodoc:
+    def initialize
+      @io = StringIO.new
+      @size = 0
+    end
+    attr_reader :size
+
+    StringMax = 10240
+    def <<(str)
+      @io << str
+      @size += str.length
+      if StringIO === @io && StringMax < @size
+        require 'tempfile'
+        io = Tempfile.new('open-uri')
+        io.binmode
+        Meta.init io, @io if @io.respond_to? :meta
+        io << @io.string
+        @io = io
+      end
+    end
+
+    def io
+      Meta.init @io unless @io.respond_to? :meta
+      @io
+    end
+  end
+
+  # Mixin for holding meta-information.
+  module Meta
+    def Meta.init(obj, src=nil) # :nodoc:
+      obj.extend Meta
+      obj.instance_eval {
+        @base_uri = nil
+        @meta = {}
+      }
+      if src
+        obj.status = src.status
+        obj.base_uri = src.base_uri
+        src.meta.each {|name, value|
+          obj.meta_add_field(name, value)
+        }
+      end
+    end
+
+    # returns an Array which consists status code and message.
+    attr_accessor :status
+
+    # returns a URI which is base of relative URIs in the data.
+    # It may differ from the URI supplied by a user because redirection.
+    attr_accessor :base_uri
+
+    # returns a Hash which represents header fields.
+    # The Hash keys are downcased for canonicalization.
+    attr_reader :meta
+
+    def meta_add_field(name, value) # :nodoc:
+      @meta[name.downcase] = value
+    end
+
+    # returns a Time which represents Last-Modified field.
+    def last_modified
+      if v = @meta['last-modified']
+        Time.httpdate(v)
+      else
+        nil
+      end
+    end
+
+    RE_LWS = /[\r\n\t ]+/n
+    RE_TOKEN = %r{[^\x00- ()<>@,;:\\"/\[\]?={}\x7f]+}n
+    RE_QUOTED_STRING = %r{"(?:[\r\n\t !#-\[\]-~\x80-\xff]|\\[\x00-\x7f])*"}n
+    RE_PARAMETERS = %r{(?:;#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?=#{RE_LWS}?(?:#{RE_TOKEN}|#{RE_QUOTED_STRING})#{RE_LWS}?)*}n
+
+    def content_type_parse # :nodoc:
+      v = @meta['content-type']
+      # The last (?:;#{RE_LWS}?)? matches extra ";" which violates RFC2045.
+      if v && %r{\A#{RE_LWS}?(#{RE_TOKEN})#{RE_LWS}?/(#{RE_TOKEN})#{RE_LWS}?(#{RE_PARAMETERS})(?:;#{RE_LWS}?)?\z}no =~ v
+        type = $1.downcase
+        subtype = $2.downcase
+        parameters = []
+        $3.scan(/;#{RE_LWS}?(#{RE_TOKEN})#{RE_LWS}?=#{RE_LWS}?(?:(#{RE_TOKEN})|(#{RE_QUOTED_STRING}))/no) {|att, val, qval|
+          val = qval.gsub(/[\r\n\t !#-\[\]-~\x80-\xff]+|(\\[\x00-\x7f])/) { $1 ? $1[1,1] : $& } if qval
+          parameters << [att.downcase, val]
+        }
+        ["#{type}/#{subtype}", *parameters]
+      else
+        nil
+      end
+    end
+
+    # returns "type/subtype" which is MIME Content-Type.
+    # It is downcased for canonicalization.
+    # Content-Type parameters are stripped.
+    def content_type
+      type, *parameters = content_type_parse
+      type || 'application/octet-stream'
+    end
+
+    # returns a charset parameter in Content-Type field.
+    # It is downcased for canonicalization.
+    #
+    # If charset parameter is not given but a block is given,
+    # the block is called and its result is returned.
+    # It can be used to guess charset.
+    #
+    # If charset parameter and block is not given,
+    # nil is returned except text type in HTTP.
+    # In that case, "iso-8859-1" is returned as defined by RFC2616 3.7.1.
+    def charset
+      type, *parameters = content_type_parse
+      if pair = parameters.assoc('charset')
+        pair.last.downcase
+      elsif block_given?
+        yield
+      elsif type && %r{\Atext/} =~ type &&
+            @base_uri && /\Ahttp\z/i =~ @base_uri.scheme
+        "iso-8859-1" # RFC2616 3.7.1
+      else
+        nil
+      end
+    end
+
+    # returns a list of encodings in Content-Encoding field
+    # as an Array of String.
+    # The encodings are downcased for canonicalization.
+    def content_encoding
+      v = @meta['content-encoding']
+      if v && %r{\A#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?(?:,#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?)*}o =~ v
+        v.scan(RE_TOKEN).map {|content_coding| content_coding.downcase}
+      else
+        []
+      end
+    end
+  end
+
+  # Mixin for HTTP and FTP URIs.
+  module OpenRead
+    # OpenURI::OpenRead#open provides `open' for URI::HTTP and URI::FTP.
+    #
+    # OpenURI::OpenRead#open takes optional 3 arguments as:
+    # OpenURI::OpenRead#open([mode [, perm]] [, options]) [{|io| ... }]
+    #
+    # `mode', `perm' is same as Kernel#open.
+    #
+    # However, `mode' must be read mode because OpenURI::OpenRead#open doesn't
+    # support write mode (yet).
+    # Also `perm' is just ignored because it is meaningful only for file
+    # creation.
+    #
+    # `options' must be a hash.
+    #
+    # Each pairs which key is a string in the hash specify a extra header
+    # field for HTTP.
+    # I.e. it is ignored for FTP without HTTP proxy.
+    #
+    # The hash may include other options which key is a symbol:
+    #
+    # [:proxy]
+    #  Synopsis:
+    #    :proxy => "http://proxy.foo.com:8000/"
+    #    :proxy => URI.parse("http://proxy.foo.com:8000/")
+    #    :proxy => true
+    #    :proxy => false
+    #    :proxy => nil
+    #   
+    #  If :proxy option is specified, the value should be String, URI,
+    #  boolean or nil.
+    #  When String or URI is given, it is treated as proxy URI.
+    #  When true is given or the option itself is not specified,
+    #  environment variable `scheme_proxy' is examined.
+    #  `scheme' is replaced by `http', `https' or `ftp'.
+    #  When false or nil is given, the environment variables are ignored and
+    #  connection will be made to a server directly.
+    #
+    # [:proxy_http_basic_authentication]
+    #  Synopsis:
+    #    :proxy_http_basic_authentication => ["http://proxy.foo.com:8000/", "proxy-user", "proxy-password"]
+    #    :proxy_http_basic_authentication => [URI.parse("http://proxy.foo.com:8000/"), "proxy-user", "proxy-password"]
+    #   
+    #  If :proxy option is specified, the value should be an Array with 3 elements.
+    #  It should contain a proxy URI, a proxy user name and a proxy password.
+    #  The proxy URI should be a String, an URI or nil.
+    #  The proxy user name and password should be a String.
+    #
+    #  If nil is given for the proxy URI, this option is just ignored.
+    #
+    #  If :proxy and :proxy_http_basic_authentication is specified, 
+    #  ArgumentError is raised.
+    #
+    # [:http_basic_authentication]
+    #  Synopsis:
+    #    :http_basic_authentication=>[user, password]
+    #
+    #  If :http_basic_authentication is specified,
+    #  the value should be an array which contains 2 strings:
+    #  username and password.
+    #  It is used for HTTP Basic authentication defined by RFC 2617.
+    #
+    # [:content_length_proc]
+    #  Synopsis:
+    #    :content_length_proc => lambda {|content_length| ... }
+    # 
+    #  If :content_length_proc option is specified, the option value procedure
+    #  is called before actual transfer is started.
+    #  It takes one argument which is expected content length in bytes.
+    # 
+    #  If two or more transfer is done by HTTP redirection, the procedure
+    #  is called only one for a last transfer.
+    # 
+    #  When expected content length is unknown, the procedure is called with
+    #  nil.
+    #  It is happen when HTTP response has no Content-Length header.
+    #
+    # [:progress_proc]
+    #  Synopsis:
+    #    :progress_proc => lambda {|size| ...}
+    #
+    #  If :progress_proc option is specified, the proc is called with one
+    #  argument each time when `open' gets content fragment from network.
+    #  The argument `size' `size' is a accumulated transfered size in bytes.
+    #
+    #  If two or more transfer is done by HTTP redirection, the procedure
+    #  is called only one for a last transfer.
+    #
+    #  :progress_proc and :content_length_proc are intended to be used for
+    #  progress bar.
+    #  For example, it can be implemented as follows using Ruby/ProgressBar.
+    #
+    #    pbar = nil
+    #    open("http://...",
+    #      :content_length_proc => lambda {|t|
+    #        if t && 0 < t
+    #          pbar = ProgressBar.new("...", t)
+    #          pbar.file_transfer_mode
+    #        end
+    #      },
+    #      :progress_proc => lambda {|s|
+    #        pbar.set s if pbar
+    #      }) {|f| ... }
+    #
+    # [:read_timeout]
+    #  Synopsis:
+    #    :read_timeout=>nil     (no timeout)
+    #    :read_timeout=>10      (10 second)
+    #
+    #  :read_timeout option specifies a timeout of read for http connections.
+    #
+    # [:ssl_ca_cert]
+    #  Synopsis:
+    #    :ssl_ca_cert=>filename
+    #
+    #  :ssl_ca_cert is used to specify CA certificate for SSL.
+    #  If it is given, default certificates are not used.
+    #
+    # [:ssl_verify_mode]
+    #  Synopsis:
+    #    :ssl_verify_mode=>mode
+    #
+    #  :ssl_verify_mode is used to specify openssl verify mode.
+    #
+    # OpenURI::OpenRead#open returns an IO like object if block is not given.
+    # Otherwise it yields the IO object and return the value of the block.
+    # The IO object is extended with OpenURI::Meta.
+    def open(*rest, &block)
+      OpenURI.open_uri(self, *rest, &block)
+    end
+
+    # OpenURI::OpenRead#read([options]) reads a content referenced by self and
+    # returns the content as string.
+    # The string is extended with OpenURI::Meta.
+    # The argument `options' is same as OpenURI::OpenRead#open.
+    def read(options={})
+      self.open(options) {|f|
+        str = f.read
+        Meta.init str, f
+        str
+      }
+    end
+  end
+end
+
+module URI
+  class Generic
+    # returns a proxy URI.
+    # The proxy URI is obtained from environment variables such as http_proxy,
+    # ftp_proxy, no_proxy, etc.
+    # If there is no proper proxy, nil is returned.
+    #
+    # Note that capitalized variables (HTTP_PROXY, FTP_PROXY, NO_PROXY, etc.)
+    # are examined too.
+    #
+    # But http_proxy and HTTP_PROXY is treated specially under CGI environment.
+    # It's because HTTP_PROXY may be set by Proxy: header.
+    # So HTTP_PROXY is not used.
+    # http_proxy is not used too if the variable is case insensitive.
+    # CGI_HTTP_PROXY can be used instead.
+    def find_proxy
+      name = self.scheme.downcase + '_proxy'
+      proxy_uri = nil
+      if name == 'http_proxy' && ENV.include?('REQUEST_METHOD') # CGI?
+        # HTTP_PROXY conflicts with *_proxy for proxy settings and
+        # HTTP_* for header information in CGI.
+        # So it should be careful to use it.
+        pairs = ENV.reject {|k, v| /\Ahttp_proxy\z/i !~ k }
+        case pairs.length
+        when 0 # no proxy setting anyway.
+          proxy_uri = nil
+        when 1
+          k, v = pairs.shift
+          if k == 'http_proxy' && ENV[k.upcase] == nil
+            # http_proxy is safe to use because ENV is case sensitive.
+            proxy_uri = ENV[name]
+          else
+            proxy_uri = nil
+          end
+        else # http_proxy is safe to use because ENV is case sensitive.
+          proxy_uri = ENV[name]
+        end
+        if !proxy_uri
+          # Use CGI_HTTP_PROXY.  cf. libwww-perl.
+          proxy_uri = ENV["CGI_#{name.upcase}"]
+        end
+      elsif name == 'http_proxy'
+        unless proxy_uri = ENV[name]
+          if proxy_uri = ENV[name.upcase]
+            warn 'The environment variable HTTP_PROXY is discouraged.  Use http_proxy.'
+          end
+        end
+      else
+        proxy_uri = ENV[name] || ENV[name.upcase]
+      end
+
+      if proxy_uri && self.host
+        require 'socket'
+        begin
+          addr = IPSocket.getaddress(self.host)
+          proxy_uri = nil if /\A127\.|\A::1\z/ =~ addr
+        rescue SocketError
+        end
+      end
+
+      if proxy_uri
+        proxy_uri = URI.parse(proxy_uri)
+        name = 'no_proxy'
+        if no_proxy = ENV[name] || ENV[name.upcase]
+          no_proxy.scan(/([^:,]*)(?::(\d+))?/) {|host, port|
+            if /(\A|\.)#{Regexp.quote host}\z/i =~ self.host &&
+               (!port || self.port == port.to_i)
+              proxy_uri = nil
+              break
+            end
+          }
+        end
+        proxy_uri
+      else
+        nil
+      end
+    end
+  end
+
+  class HTTP
+    def buffer_open(buf, proxy, options) # :nodoc:
+      OpenURI.open_http(buf, self, proxy, options)
+    end
+
+    include OpenURI::OpenRead
+  end
+
+  class FTP
+    def buffer_open(buf, proxy, options) # :nodoc:
+      if proxy
+        OpenURI.open_http(buf, self, proxy, options)
+        return
+      end
+      require 'net/ftp'
+
+      directories = self.path.split(%r{/}, -1)
+      directories.shift if directories[0] == '' # strip a field before leading slash
+      directories.each {|d|
+        d.gsub!(/%([0-9A-Fa-f][0-9A-Fa-f])/) { [$1].pack("H2") }
+      }
+      unless filename = directories.pop
+        raise ArgumentError, "no filename: #{self.inspect}"
+      end
+      directories.each {|d|
+        if /[\r\n]/ =~ d
+          raise ArgumentError, "invalid directory: #{d.inspect}"
+        end
+      }
+      if /[\r\n]/ =~ filename
+        raise ArgumentError, "invalid filename: #{filename.inspect}"
+      end
+      typecode = self.typecode
+      if typecode && /\A[aid]\z/ !~ typecode
+        raise ArgumentError, "invalid typecode: #{typecode.inspect}"
+      end
+
+      # The access sequence is defined by RFC 1738
+      ftp = Net::FTP.open(self.host)
+      # todo: extract user/passwd from .netrc.
+      user = 'anonymous'
+      passwd = nil
+      user, passwd = self.userinfo.split(/:/) if self.userinfo
+      ftp.login(user, passwd)
+      directories.each {|cwd|
+        ftp.voidcmd("CWD #{cwd}")
+      }
+      if typecode
+        # xxx: typecode D is not handled.
+        ftp.voidcmd("TYPE #{typecode.upcase}")
+      end
+      if options[:content_length_proc]
+        options[:content_length_proc].call(ftp.size(filename))
+      end
+      ftp.retrbinary("RETR #{filename}", 4096) { |str|
+        buf << str
+        options[:progress_proc].call(buf.size) if options[:progress_proc]
+      }
+      ftp.close
+      buf.io.rewind
+    end
+
+    include OpenURI::OpenRead
+  end
+end