security - Nginx block POST for certain countries -

i have reverse proxy nginx tomcat.

my goal ban total access countries , ban post countries except one.

total access ban countries can achieved via iptables @ kernel level. easy task.

my dilemma how ban post countries except one. rest of them can see website (get) don't want them create accounts, or post data.

i filter listing forms use post, many.

is way filter nginx post?

thank you

geo $ip_country {   ranges;   default zz;   include /usr/local/nginx/conf/ip_country.conf; }  set $method_country $request_method$ip_country; if ($method_country ~ "post(?!au)") {     return 405; } 

ip_country.conf format like:

0.0.0.0-0.255.255.255 eu; 1.0.0.0-1.0.0.255     au; 1.0.1.0-1.0.3.255     cn; 1.0.4.0-1.0.7.255     au; 1.0.8.0-1.0.15.255    cn; 1.0.16.0-1.0.31.255   jp; 1.0.32.0-1.0.63.255   cn; 1.0.64.0-1.0.127.255  jp; 1.0.128.0-1.0.255.255 th; 1.1.0.0-1.1.0.255     cn; ... 

and use $ip_country value inside scripts with:

fastcgi_param ip_country $ip_country;