Http::Headers respects headers that are not prefixed with HTTP_

actionpack/CHANGELOG.md

@@ -1,5 +1,9 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   Http::Headers respects headers that are not prefixed with HTTP_
+
+    *Yves Senn*
+
 *   Fix incorrectly appended square brackets to a multiple select box
     if an explicit name has been given and it already ends with "[]"
 

actionpack/lib/action_dispatch/http/headers.rb

@@ -1,6 +1,16 @@
 module ActionDispatch
   module Http
     class Headers
+      NON_PREFIX_VARIABLES = %w(
+        CONTENT_TYPE CONTENT_LENGTH
+        HTTPS AUTH_TYPE GATEWAY_INTERFACE
+        PATH_INFO PATH_TRANSLATED QUERY_STRING
+        REMOTE_ADDR REMOTE_HOST REMOTE_IDENT REMOTE_USER
+        REQUEST_METHOD SCRIPT_NAME
+        SERVER_NAME SERVER_PORT SERVER_PROTOCOL SERVER_SOFTWARE
+      )
+      HEADER_REGEXP = /\A[A-Za-z-]+\z/
+
       include Enumerable
 
       def initialize(env = {})
@@ -32,7 +42,9 @@ module ActionDispatch
       end
 
       def cgi_name(k)
-        "HTTP_#{k.upcase.gsub(/-/, '_')}"
+        k = k.upcase.gsub(/-/, '_')
+        k = "HTTP_#{k.upcase.gsub(/-/, '_')}" unless NON_PREFIX_VARIABLES.include?(k)
+        k
       end
     end
   end

actionpack/test/dispatch/header_test.rb

@@ -3,14 +3,16 @@ require 'abstract_unit'
 class HeaderTest < ActiveSupport::TestCase
   def setup
     @headers = ActionDispatch::Http::Headers.new(
-      "HTTP_CONTENT_TYPE" => "text/plain"
+      "CONTENT_TYPE" => "text/plain",
+      "HTTP_REFERER" => "/some/page"
     )
   end
 
   def test_each
     headers = []
     @headers.each { |pair| headers << pair }
-    assert_equal [["HTTP_CONTENT_TYPE", "text/plain"]], headers
+    assert_equal [["CONTENT_TYPE", "text/plain"],
+                  ["HTTP_REFERER", "/some/page"]], headers
   end
 
   def test_setter
@@ -19,19 +21,24 @@ class HeaderTest < ActiveSupport::TestCase
   end
 
   def test_key?
-    assert @headers.key?('HTTP_CONTENT_TYPE')
+    assert @headers.key?('CONTENT_TYPE')
-    assert @headers.include?('HTTP_CONTENT_TYPE')
+    assert @headers.include?('CONTENT_TYPE')
   end
 
   def test_fetch_with_block
     assert_equal 'omg', @headers.fetch('notthere') { 'omg' }
   end
 
-  test "content type" do
+  test "accessing http header" do
+    assert_equal "/some/page", @headers["Referer"]
+    assert_equal "/some/page", @headers["referer"]
+    assert_equal "/some/page", @headers["HTTP_REFERER"]
+  end
+
+  test "accessing special header" do
     assert_equal "text/plain", @headers["Content-Type"]
     assert_equal "text/plain", @headers["content-type"]
     assert_equal "text/plain", @headers["CONTENT_TYPE"]
-    assert_equal "text/plain", @headers["HTTP_CONTENT_TYPE"]
   end
 
   test "fetch" do