have been experiencing a problem yesterday. My site is in Hebrew language. MY site is built on Wordpress. The problem is related to escaped encoded posts URL only. IF the post URL has escaped encode in uppercase it works, if in lowercase, it returns 404. I want both to pass without a problem.
For example: http://domain.com/%d7%9e%d7%a6%d7%9c%d7%9e%d7%95%d7%aa/ (this is what my site have)
Google crawled it as: http://domain.com/%D7%9E%D7%a6%D7%9C%D7%9E%D7%95%D7%AA/ (this returned 404)
Is there any option to use the REDIRECTION plugin for wordpress to PASS (not redirect) the URLs o wordpress will see them as lowercase?