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Plesk Nginx Browser caching on port 3100?

xberg

New Pleskian
Hi
I want to enable browser caching for a single .JS file served thru port 3100.

For all normal web files I use this in my Plesk Apache / nginx custom field:

location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
expires 30d;
add_header Cache-Control "public";
try_files $uri @fallback;
etag on;
if_modified_since before;
access_log off;
}

This works for my port 80 files.
But I have a single file served thru port 3100:
http://mysite.com:3100/socket.io/socket.io.js

This file never gets cached.
Is there an easy instruction to also enable browser caching for this file from this 3100 port? This takes a full 100ms to load on each page of my site.
 
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