Rails - Sep 2013 - 400 bad request

Hi,

Im using nginx and rails for my site which contains url with georgian 
letters ie განცხადებები so something like 
http://gancxadebebi.ge/ka/%E1%83%92%E1%83%90%E1%83%9C%E1%83%AA%E1%83%AE%E1%83%90%E1%83%93%E1%83%94%E1%83%91%E1%83%94%E1%83%91%E1%83%98
It is mainly working perfectly but sometimes I receive request with 
truncated url ie 
1 - 
http://gancxadebebi.ge/ka/%E1%83%92%E1%83%90%E1%83%9C%E1%83%AA%E1%83%AE%E1%83%90%E1%83%93%E1%83%94%E1%83%91%E1%83%94%E1%83%91%E1%83%9
(as u can see it should be something after %9)
or
2 - 
http://gancxadebebi.ge/ka/%E1%83%92%E1%83%90%E1%83%9C%E1%83%AA%E1%83%AE%E1%83%90%E1%83%93%E1%83%94%E1%83%91%E1%83%94%E1%83%91%E1%83%98?mc=mini+aipadi&search=%E1%83%AB%E1%83%98%E1%83%94%E1%83%91%E1%83%9

I succeeded to deal when there is no get parameters (first url above) and 
make in that case a redirection to /
when this happen, this line is added to nginx error.log
2013/09/24 00:46:53 [alert] 63547#0: *19359227 pcre_exec() failed: -10 on 
"/ka/განცხადებებ�" using "", client: aa.bb.cc.dd, server:
gancxadebebi.ge,
request: "GET 
/ka/%E1%83%92%E1%83%90%E1%83%9C%E1%83%AA%E1%83%AE%E1%83%90%E1%83%93%E1%83%94%E1%83%91%E1%83%94%E1%83%91%E1%8
HTTP/1.1", host: "gancxadebebi.ge"

but for second url, which have get parameter truncated, I can not handle 
that which generate a 400 bad request page.
such request added this line in nginx access.log
aa.bb.cc.dd - - [24/Sep/2013:00:48:47 +0200] "GET 
/ka/%E1%83%92%E1%83%90%E1%83%9C%E1%83%AA%E1%83%AE%E1%83%90%E1%83%93%E1%83%94%E1%83%91%E1%83%94%E1%83%91%E1%83%98?mc=mini+aipadi&search=%E1%83%AB%E1%83%98%E1%83%94%E1%83%91%E1%83%
HTTP/1.1" 400 5 "-" "Mozilla/5.0 (X11; Linux x86_64)
AppleWebKit/537.36
(KHTML, like Gecko) Chrome/29.0.1547.76 Safari/537.36"

does this mean that nginx accepted the request and then rails coudnt 
resolve it ?

I don''t know if problem come from rails or from nginx. For first url, I
solved it in nginx conf 
here part of my conf

    access_log /var/log/nginx/gancx.access.log;
    error_log /var/log/nginx/gancx.error.log;

    client_body_in_file_only clean;
    client_body_buffer_size 32K;
    charset UTF-8;
    source_charset UTF-8;
    client_max_body_size 300M;



    error_page  400 404         = @notfound;
    error_page  500 502 504 = @server_error;
    error_page  503         = @maintenance;

    location @notfound {
      rewrite ^(.*)$ $scheme://$host permanent;
    }

    location @server_error {
        rewrite ^(.*)$ $scheme://$host permanent;
    }

    location @maintenance {
        rewrite ^(.*)$ $scheme://$host permanent;
    }
    sendfile on;
    send_timeout 300s;

    location / {
        proxy_pass http://gancx;
        proxy_redirect off;

        proxy_set_header   Host             $host;
        proxy_set_header   X-Real-IP        $remote_addr;
        proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        charset UTF-8;
        client_max_body_size 7m;
        proxy_buffer_size          4k;
        proxy_buffers              4 32k;
        proxy_busy_buffers_size    64k;
        proxy_temp_file_write_size 64k;
    }


thanks for your help

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