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I am using node.js with https://github.com/visionmedia/connect-redis to store session variables in redis.
I ran redis-cli monitor and noticed that on a single page load, there are 3 sets of get and setex commands being executed. The 3 sets come from the 3 http requests made on my page load (favicon.ico, /, and index.css).
My question: Is it normal for a redis get and setex to run on every http request? Each pair contains identical data.
The 3 HTTP gets that you are seeing are normal for a web application.
You can set a very long expiration date on your favicon.ico so that the browser only requests it once.
For static assets (i.e. CSS, JS, images) you can do the same or put them in a different domain (or subdomain)
Be aware that if you put a very long expiration date on a CSS/JS file the browse will not request it again and you might run into weird “issues” in which you make a change to a CSS/JS file and the browser might not get the updated file. This is one of the reasons a lot of sites “version” their CSS files (e.g. styles-2013-02-17.css) so that they can use a different file name when a change is made.