meta_vars should be String.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4537 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/webrick/httprequest.rb

@@ -185,7 +185,7 @@ module WEBrick
       meta["REQUEST_URI"]       = @request_uri.to_s
       meta["SCRIPT_NAME"]       = @script_name.dup
       meta["SERVER_NAME"]       = @host
-      meta["SERVER_PORT"]       = @port
+      meta["SERVER_PORT"]       = @port.to_s
       meta["SERVER_PROTOCOL"]   = "HTTP/" + @config[:HTTPVersion].to_s
       meta["SERVER_SOFTWARE"]   = @config[:ServerSoftware].dup