svn - Nginx subversion commit failure

Hi I have trouble in committing php scripts to subverison. I am using Nginx web server to send request to apache server using mod_proxy setting of nginx for commiting files, svn checkout and updates works fine.

server {
        listen  80;
        server_name svn.server;
        location / {
        access_log off;

        proxy_pass http://localhost:8081;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }


       location  ~ ^/repos/.*.php$  {

                fastcgi_pass 127.0.0.1:9000;

                fastcgi_index index.php;
                include fastcgi_params;
        }


}