How to Add Expires headers on nginx - nginx

Question

According to GTMetrix:
There are 6 static components without a far-future expiration date.
http://linuxedgr.disqus.com/recent_comments_widget.js?num_items=5&hide_mods=0&hide_avatars=0&avatar_size=32&excerpt_length=100
http://s7.addthis.com/js/300/addthis_widget.js#pubid=ra-548e3c553a19ddf3
http://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700
http://www.google-analytics.com/ga.js
http://a.disquscdn.com/count.js
http://linuxedgr.disqus.com/count-data.js?1=egkatastasi-tou-nginx&1=eisagogi-ston-nginx&1=new-dedicated-server-in-da-house-me-5-euro&1=o-epimenon-nika&1=pos-mporo-na-kano-encrypt-kai-decrypt-arxeia-xrismopoiontas-to-openssl-toolkit&1=pos-sindeo-ena-domain-apo-tin-IPHost-me-tin-ip-tou-server-mou
At my /etc/nginx/vhosts.d/www.linuxed.gr.conf
server {
listen 80;
# Δώσε το absolute path που εχεις τα αρχεία του website
root /var/www/html/linuxed;
# Όριστε το index file
index index.html index.html index.php;
# Δώσε το όνομα του domain και το alias
# τα οποια πρεπει να τα εχει δηλώσει και στο /etc/hosts
server_name www.linuxed.gr linuxed.gr;
# Συμπίεση
gzip on;
gzip_disable "msie6";
gzip_comp_level 6;
gzip_min_length 1100;
gzip_buffers 16 8k;
gzip_http_version 1.1;
gzip_proxied any;
gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
# specify a vary: accept-encoding header
gzip_vary on;
# Όριστε μία 404 page
error_page 404 /error-404.html;
location = /error-404.html {
root /var/www/html/linuxed/;
}
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html/;
}
# Disable favicon.ico logging
location = /favicon.ico {
log_not_found off;
access_log off;
}
# Allow robots and disable logging
location = /robots.txt {
allow all;
log_not_found off;
access_log off;
}
############################
# Leverage browser caching #
############################
location ~* \.(jpg|jpeg|png|gif|ico|css|js)$ {
expires max;
log_not_found off;
add_header Pragma public;
add_header Cache-Control "public";
}
# Deny access to htaccess and htpasswd files
location ~ /\.ht {
deny all;
}
}
Also here's my /etc/nginx/nginx.conf
user nginx;
worker_processes 4;
error_log /var/log/nginx/error.log;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
use epoll;
}
http {
include mime.types;
default_type application/octet-stream;
types_hash_max_size 2048;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log off;
# Tcp_nopush causes nginx to attempt to send its HTTP response head in one packet,
# instead of using partial frames. This is useful for prepending headers before
# calling sendfile or for throughput optimization.
tcp_nopush on;
# don't buffer data-sends (disable Nagle algorithm). Good for sending frequent
# small bursts of data in real time.
tcp_nodelay on;
sendfile on;
# allow the server to close the connection after a client stops responding.
#Frees up socket-associated memory.
reset_timedout_connection on;
gzip on;
gzip_disable "msie6";
client_body_buffer_size 10k;
client_header_buffer_size 1k;
client_max_body_size 8m;
large_client_header_buffers 2 1k;
client_body_timeout 12;
client_header_timeout 12;
keepalive_timeout 15;
send_timeout 10;
include conf.d/*.conf;
include vhosts.d/*.conf;
}
I think my configuration is quite right. How ever I am getting this message at GTMetrix website. How can I fix that?

Answer 1

All 6 resources which GTMetrix pointed out are from external domains and the expiration headers were not set with far-future expiration date because they might get changed very frequently and thus caching them may not give desired results.
You cannot do any thing from your server side about the expiration header warnings for those external resource. What GTMetrix displays is just a warning which can be ignored.