* lib/net/http/header.rb: Warn nil variable on HTTP Header.

It caused to NoMethodError. [fix GH-952][fix GH-641] Patch by @teosz
* test/net/http/test_httpheader.rb: Added test for nil HTTP Header.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53679 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Fri Jan 29 10:44:56 2016  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
+
+	* lib/net/http/header.rb: Warn nil variable on HTTP Header.
+	  It caused to NoMethodError. [fix GH-952][fix GH-641] Patch by @teosz
+	* test/net/http/test_httpheader.rb: Added test for nil HTTP Header.
+
 Thu Jan 28 17:31:43 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/socket/socket.c (sock_gethostname): support unlimited size

lib/net/http/header.rb

@@ -15,7 +15,11 @@ module Net::HTTPHeader
     return unless initheader
     initheader.each do |key, value|
       warn "net/http: warning: duplicated HTTP header: #{key}" if key?(key) and $VERBOSE
-      @header[key.downcase] = [value.strip]
+      if value.nil?
+        warn "net/http: warning: nil HTTP header: #{key}" if $VERBOSE
+      else
+        @header[key.downcase] = [value.strip]
+      end
     end
   end
 
@@ -450,4 +454,3 @@ module Net::HTTPHeader
   private :tokens
 
 end
-

test/net/http/test_httpheader.rb

@@ -82,6 +82,12 @@ class HTTPHeaderTest < Test::Unit::TestCase
     assert_equal ['test string'], @c.get_fields('my-header')
   end
 
+  class D; include Net::HTTPHeader; end
+
+  def test_nil_variable_header
+    assert_nothing_raised { D.new.initialize_http_header({Authorization: nil}) }
+  end
+
   def test_delete
     @c['My-Header'] = 'test'
     assert_equal 'test', @c['My-Header']