How can I set NGINX to understand GET parameters without the "?" sign?

Question

Nginx

Hello!
Guru NGINX tell me pliz.
Moved a site from Apache, where the URL "mysite.com/katalog/kaminnye-topki/&filter=p:31875,64755..." worked, but now it doesn't work. but if there is a question mark ("?") defining the beginning of the parameters, then everything is buzzing. ("mysite.com/katalog/kaminnye-topki/?&filter=p:31875,64755..." ).
How to configure NGINX to understand GET parameters without "?" ?
write about what you need necessarily a question mark, it is not necessary. I know it. I don't want to get into the code.
I am attaching the config:

server {
     listen 46.30.42.1:80;
     server_name mysite.ru www.mysite.ru;
     root        /home/mysite/web/mysite.ru/public_html;
     index       index.php index.html index.htm;
     access_log  /var/log/nginx/domains/mysite.ru.log combined;
     access_log  /var/log/nginx/domains/mysite.ru.bytes bytes;
     error_log   /var/log/nginx/domains/mysite.ru.error.log error;

location / { try_files $uri @opencart; }

location @opencart { rewrite ^/(.+)$ /index.php?_route_=$1 last; }

location ~ /\.ht { deny all; }

location ~* (\.(tpl|ini))$ { deny all; }

if (!-e $request_filename) { rewrite ^/(.*)$ /index.php?_route_=$1 last; }

location /Immortal { index index.php; }
location ~* .(js|css|ico|xml|swf|flv|eot|ttf|woff|pdf|xls|htc)$ {
  add_header Pragma "public";
  add_header Cache-Control "public, must-revalidate, proxy-revalidate";
      access_log off;
      log_not_found off;
      expires   90d;
}

  # Vqmod settings
  # Add trailing slash to */vqmod/install requests.
  rewrite /vqmod/install$ $scheme://$host$uri/ permanent;
  
  # Run index.php on /vqmod/install calls
  location /vqmod/install/ {
    index index.php;
  }
  
  # Nginx configuration of vqmod htaccess
  location /home/mysite/web/mysite.ru/public_html/vqmod/ {
    location ~ \.(xml|cache) {
      deny all;
    }
  }
  # End Vqmod settings  

location ~* .(jpg|jpeg|gif|css|png)$ {
access_log off;
expires 10d;
}
location ~ .php$ {
fastcgi_pass 127.0.0.1:9001;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_intercept_errors on;
fastcgi_ignore_client_abort off;
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
}
}

Answer 1

a question mark is required