Should a REST API be case sensitive or non case sensitive?

Question

At work we got a problem with case sensitive REST api which ignores wrongly spelled parameters without returning any error. In my opinion this is bad. Then it comes the gene

Answer 1

HTTP URLs are case-insensitive for the scheme and host portion and case-sensitive for the path, query and fragment.

http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-25#page-19