Ahh but that is not the value that is sent to the webserver, that is just your web browser prettying up the display. If we open the inspector and see what was sent we have:

Request URL:https://ja.wikipedia.org/wiki/%E3%83%99%E3%83%BC%E3%82%AB%E3...

Your browser will equally pretty up the json in the url for display purposes.

Or, as it shows up for me, http://ja.wikipedia.org/wiki/%E3%83%99%E3%83%BC%E3%82%AB%E3%...