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@@ -3,8 +3,8 @@ require 'action_view/helpers/javascript_helper'
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 module ActionView
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   module Helpers #:nodoc:
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     # Provides a set of methods for making links and getting URLs that
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-    # depend on the routing subsystem (see ActionController::Routing). 
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-    # This allows you to use the same format for links in views 
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+    # depend on the routing subsystem (see ActionController::Routing).
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+    # This allows you to use the same format for links in views
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     # and controllers.
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     module UrlHelper
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       include JavaScriptHelper
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@@ -33,8 +33,8 @@ module ActionView
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       #
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       # If you instead of a hash pass a record (like an Active Record or Active Resource) as the options parameter,
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       # you'll trigger the named route for that record. The lookup will happen on the name of the class. So passing
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-      # a Workshop object will attempt to use the workshop_path route. If you have a nested route, such as 
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-      # admin_workshop_path you'll have to call that explicitly (it's impossible for url_for to guess that route). 
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+      # a Workshop object will attempt to use the workshop_path route. If you have a nested route, such as
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+      # admin_workshop_path you'll have to call that explicitly (it's impossible for url_for to guess that route).
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       #
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       # ==== Examples
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       #   <%= url_for(:action => 'index') %>
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@@ -62,19 +62,33 @@ module ActionView
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       #   <%= url_for(@workshop) %>
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       #   # calls @workshop.to_s
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       #   # => /workshops/5
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+      #
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+      #   <%= url_for("http://www.example.com") %>
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+      #   # => http://www.example.com
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+      #
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+      #   <%= url_for(:back) %>
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+      #   # if request.env["HTTP_REFERER"] is set to "http://www.example.com"
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+      #   # => http://www.example.com
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+      #
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+      #   <%= url_for(:back) %>
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+      #   # if request.env["HTTP_REFERER"] is not set or is blank
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+      #   # => javascript:history.back()
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       def url_for(options = {})
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         options ||= {}
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-        case options
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+        url = case options
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+        when String
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+          escape = true
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+          options
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         when Hash
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           options = { :only_path => options[:host].nil? }.update(options.symbolize_keys)
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           escape  = options.key?(:escape) ? options.delete(:escape) : true
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-          url     = @controller.send(:url_for, options)
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-        when String
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-          escape = true
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-          url    = options
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+          @controller.send(:url_for, options)
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+        when :back
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+          escape = false
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+          @controller.request.env["HTTP_REFERER"] || 'javascript:history.back()'
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         else
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           escape = false
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-          url    = polymorphic_path(options)
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+          polymorphic_path(options)
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         end
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         escape ? escape_once(url) : url
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@@ -116,8 +130,8 @@ module ActionView
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       #
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       # Note that if the user has JavaScript disabled, the request will fall back
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       # to using GET. If <tt>:href => '#'</tt> is used and the user has JavaScript disabled
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-      # clicking the link will have no effect. If you are relying on the POST 
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-      # behavior, your should check for it in your controller's action by using the 
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+      # clicking the link will have no effect. If you are relying on the POST
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+      # behavior, your should check for it in your controller's action by using the
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       # request object's methods for <tt>post?</tt>, <tt>delete?</tt> or <tt>put?</tt>.
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       #
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       # You can mix and match the +html_options+ with the exception of
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@@ -141,8 +155,8 @@ module ActionView
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       #
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       #   link_to "Profile", :controller => "profiles", :action => "show", :id => @profile
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       #   # => <a href="/profiles/show/1">Profile</a>
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-      # 
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-      # Similarly, 
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+      #
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+      # Similarly,
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       #
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       #   link_to "Profiles", profiles_path
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       #   # => <a href="/profiles">Profiles</a>
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@@ -197,9 +211,9 @@ module ActionView
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       #   # => <a href="/images/9" onclick="window.open(this.href,'new_window_name','height=300,width=600');return false;">View Image</a>
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       #
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       #   link_to "Delete Image", @image, :confirm => "Are you sure?", :method => :delete
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-      #   # => <a href="/images/9" onclick="if (confirm('Are you sure?')) { var f = document.createElement('form'); 
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+      #   # => <a href="/images/9" onclick="if (confirm('Are you sure?')) { var f = document.createElement('form');
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       #        f.style.display = 'none'; this.parentNode.appendChild(f); f.method = 'POST'; f.action = this.href;
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-      #        var m = document.createElement('input'); m.setAttribute('type', 'hidden'); m.setAttribute('name', '_method'); 
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+      #        var m = document.createElement('input'); m.setAttribute('type', 'hidden'); m.setAttribute('name', '_method');
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       #        m.setAttribute('value', 'delete'); f.appendChild(m);f.submit(); };return false;">Delete Image</a>
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       def link_to(*args, &block)
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         if block_given?
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@@ -211,14 +225,7 @@ module ActionView
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           options      = args.second || {}
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           html_options = args.third
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-          url = case options
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-            when String
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-              options
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-            when :back
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-              @controller.request.env["HTTP_REFERER"] || 'javascript:history.back()'
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-            else
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-              self.url_for(options)
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-            end
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+          url = url_for(options)
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           if html_options
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             html_options = html_options.stringify_keys
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@@ -228,7 +235,7 @@ module ActionView
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           else
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             tag_options = nil
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           end
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-      
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+
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           href_attr = "href=\"#{url}\"" unless href
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           "<a #{href_attr}#{tag_options}>#{name || url}</a>"
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         end
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@@ -260,7 +267,7 @@ module ActionView
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       # * <tt>:confirm</tt> - This will add a JavaScript confirm
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       #   prompt with the question specified. If the user accepts, the link is
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       #   processed normally, otherwise no action is taken.
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-      # 
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+      #
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       # ==== Examples
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       #   <%= button_to "New", :action => "new" %>
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       #   # => "<form method="post" action="/controller/new" class="button-to">
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@@ -286,12 +293,12 @@ module ActionView
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         end
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         form_method = method.to_s == 'get' ? 'get' : 'post'
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-        
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+
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         request_token_tag = ''
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         if form_method == 'post' && protect_against_forgery?
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           request_token_tag = tag(:input, :type => "hidden", :name => request_forgery_protection_token.to_s, :value => form_authenticity_token)
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         end
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-        
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+
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         if confirm = html_options.delete("confirm")
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           html_options["onclick"] = "return #{confirm_javascript_function(confirm)};"
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         end
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@@ -309,7 +316,7 @@ module ActionView
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       # Creates a link tag of the given +name+ using a URL created by the set of
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       # +options+ unless the current request URI is the same as the links, in
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       # which case only the name is returned (or the given block is yielded, if
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-      # one exists).  You can give link_to_unless_current a block which will 
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+      # one exists).  You can give link_to_unless_current a block which will
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       # specialize the default behavior (e.g., show a "Start Here" link rather
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       # than the link's text).
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       #
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@@ -336,13 +343,13 @@ module ActionView
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       #   </ul>
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       #
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       # The implicit block given to link_to_unless_current is evaluated if the current
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-      # action is the action given.  So, if we had a comments page and wanted to render a 
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+      # action is the action given.  So, if we had a comments page and wanted to render a
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       # "Go Back" link instead of a link to the comments page, we could do something like this...
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-      #   
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-      #    <%= 
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+      #
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+      #    <%=
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       #        link_to_unless_current("Comment", { :controller => 'comments', :action => 'new}) do
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-      #           link_to("Go back", { :controller => 'posts', :action => 'index' }) 
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-      #        end 
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+      #           link_to("Go back", { :controller => 'posts', :action => 'index' })
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+      #        end
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       #     %>
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       def link_to_unless_current(name, options = {}, html_options = {}, &block)
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         link_to_unless current_page?(options), name, options, html_options, &block
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@@ -359,10 +366,10 @@ module ActionView
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       #   # If the user is logged in...
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       #   # => <a href="/controller/reply/">Reply</a>
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       #
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-      #   <%= 
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+      #   <%=
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       #      link_to_unless(@current_user.nil?, "Reply", { :action => "reply" }) do |name|
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       #        link_to(name, { :controller => "accounts", :action => "signup" })
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-      #      end 
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+      #      end
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       #   %>
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       #   # If the user is logged in...
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       #   # => <a href="/controller/reply/">Reply</a>
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@@ -391,10 +398,10 @@ module ActionView
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       #   # If the user isn't logged in...
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       #   # => <a href="/sessions/new/">Login</a>
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       #
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-      #   <%= 
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+      #   <%=
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       #      link_to_if(@current_user.nil?, "Login", { :controller => "sessions", :action => "new" }) do
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       #        link_to(@current_user.login, { :controller => "accounts", :action => "show", :id => @current_user })
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-      #      end 
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+      #      end
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       #   %>
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       #   # If the user isn't logged in...
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       #   # => <a href="/sessions/new/">Login</a>
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@@ -431,20 +438,20 @@ module ActionView
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       # * <tt>:bcc</tt>  - Blind Carbon Copy additional recipients on the email.
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       #
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       # ==== Examples
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-      #   mail_to "me@domain.com" 
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+      #   mail_to "me@domain.com"
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       #   # => <a href="mailto:me@domain.com">me@domain.com</a>
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       #
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-      #   mail_to "me@domain.com", "My email", :encode => "javascript"  
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+      #   mail_to "me@domain.com", "My email", :encode => "javascript"
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       #   # => <script type="text/javascript">eval(unescape('%64%6f%63...%6d%65%6e'))</script>
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       #
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-      #   mail_to "me@domain.com", "My email", :encode => "hex"  
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+      #   mail_to "me@domain.com", "My email", :encode => "hex"
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       #   # => <a href="mailto:%6d%65@%64%6f%6d%61%69%6e.%63%6f%6d">My email</a>
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       #
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-      #   mail_to "me@domain.com", nil, :replace_at => "_at_", :replace_dot => "_dot_", :class => "email"  
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+      #   mail_to "me@domain.com", nil, :replace_at => "_at_", :replace_dot => "_dot_", :class => "email"
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       #   # => <a href="mailto:me@domain.com" class="email">me_at_domain_dot_com</a>
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       #
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       #   mail_to "me@domain.com", "My email", :cc => "ccaddress@domain.com",
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-      #            :subject => "This is an example email"  
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+      #            :subject => "This is an example email"
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       #   # => <a href="mailto:me@domain.com?cc=ccaddress@domain.com&subject=This%20is%20an%20example%20email">My email</a>
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       def mail_to(email_address, name = nil, html_options = {})
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         html_options = html_options.stringify_keys

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@@ -28,6 +28,16 @@ class UrlHelperTest < ActionView::TestCase
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     assert_equal "http://www.example.com?a=b&amp;c=d", url_for("http://www.example.com?a=b&amp;c=d")
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   end
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+  def test_url_for_with_back
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+    @controller.request = RequestMock.new("http://www.example.com/weblog/show", nil, nil, {'HTTP_REFERER' => 'http://www.example.com/referer'})
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+    assert_equal 'http://www.example.com/referer', url_for(:back)
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+  end
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+
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+  def test_url_for_with_back_and_no_referer
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+    @controller.request = RequestMock.new("http://www.example.com/weblog/show", nil, nil, {})
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+    assert_equal 'javascript:history.back()', url_for(:back)
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+  end
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+
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   # todo: missing test cases
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   def test_button_to_with_straight_url
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     assert_dom_equal "<form method=\"post\" action=\"http://www.example.com\" class=\"button-to\"><div><input type=\"submit\" value=\"Hello\" /></div></form>", button_to("Hello", "http://www.example.com")
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@@ -419,7 +429,6 @@ class LinkToUnlessCurrentWithControllerTest < ActionView::TestCase
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     end
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 end
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-
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 class Workshop
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   attr_accessor :id, :new_record
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