I set this rewrite rule

RewriteRule ^(.+)/ /user.php?nickname=$1&%{QUERY_STRING} [nc]

but I have a problem, if I get www.domain. com/nickname/ it work but if get www.domain. com/nickname the server responce with error 404, the problem is " / " to end of url.

Hmm..

Search in this question. It should help you I guess.

http://httpd.apache.org/docs/2.2/misc/rewriteguide.html

You need to make the trailing slash optional I believe. I'm sorry I can't remember what the regex is for that off the top of my head but I think it'll help you.