Enable cache only for static content using reversed proxy (Nginx + Tomcat) - nginx

Question

I have installed Nginx 1.8.0 that works with a reversed proxy to a Tomcat 8, everything's works perfectly. However, I would like to enable proxy-cache ONLY for images, CSS and js (primarily static content); I would not like to cache any get to the server because the values may change from one request to other.
I found some configuration but still not working for me, do you guys know how to configure it correctly?
I saw this https://serverfault.com/questions/494669/setting-up-a-reverse-proxy-to-cache-images post; however is not clear for me that it will cache only static content, seems that it will cache any 200 response.
Thanks a lot...
-- UPDATE --
I have my images (blablasite.com/images), same for js and css; just replace images for js and css
I have something like this
server {
listen 80;
server_name blablasite.com;
# add ssl settings
return 301 https://$host$request_uri;
}
server {
listen 443;
server_name blablasite.com;
root html;
keepalive_timeout 70;
client_max_body_size 50m;
#charset koi8-r;
ssl_certificate /blablasite.com-combined.crt;
ssl_certificate_key /ssl/blablasite.com.key;
ssl on;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
#ssl_ciphers HIGH:!aNULL:!eNULL:!EXPORT:!CAMELLIA:!DES:!MD5:!PSK:!RC4;
ssl_session_cache shared:SSL:10m;
ssl_prefer_server_ciphers on;
# HTTP Strict Transport Security
add_header Strict-Transport-Security "max-age=63072000; includeSubdomains; preload";
add_header X-Frame-Options "DENY";
# OCSP Stapling
ssl_stapling on;
ssl_stapling_verify on;
resolver 8.8.8.8 8.8.4.4 valid=300s;
resolver_timeout 5s;
access_log /var/log/nginx/host.access.log main;
# Media: images, icons, video, audio, HTC
location ~* \.(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
expires 1d;
access_log off;
add_header Cache-Control "public";
# boilerplate copied from location /
proxy_pass http://localhost:8080;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
}
location / {
if (-f /webapps/blablasite/maintenance_on.html) {
return 503;
}
index index.html index.jsp;
proxy_pass http://localhost:8080;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
}
location /login {
# apply rate limiting
limit_req zone=login burst=5;
# boilerplate copied from location /
proxy_pass http://localhost:8080;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
}