Добрый день!
location /upload {                                                      
                                                                        
   
upload_pass @back_to_page;                                              
                                                                       
            upload_store /var/tmp;                                   
        }                                                               
                                                                        
           
                                                                        
                                                                        
           
        location @back_to_page {                                        
                                                                        
           
            #proxy_pass $http_referer;                                  
                                                                        
           
            rewrite ^.*$ $http_referer;                                 
                                                                        
           
        }
Posted at Nginx Forum: http://forum.nginx.org/read.php?21,201091,201091#msg-201091