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Rogier Mulhuijzen

Senior Professional Services Engineer
May 3

Leveraging the browser cache with Fastly’s CDN

Since a CDN is essentially a cache, you might be tempted to avoid complexity by not making use of the browser cache. However, each cache has its own advantages that the other does not…

September 13

How to solve anything in VCL, part 1: collecting data at the edge

At our second annual customer summit, Andrew Betts of the Financial Times discussed using VCL to “solve anything” — pushing his team’s problems to the CDN layer.

May 21

The VCL Cookie Monster

This month's tip is more a theoretical exercise than anything else, just to show the power of VCL, and to explain a few regular expressions. I'm going to discuss VCL that deletes cookies.

April 22

Reusing backend connections to increase performance

Reusing connections between your Varnish instance and your backends (origins) is a good idea for multiple reasons. If your Varnish is on the same network as your backends and you're doing…

March 18

Common causes of a poor cache hit ratio and how to deal with them

The cache hit ratio (or hit ratio for short) is the ratio of hits to cacheable requests (hits and misses combined). There's also cache coverage, the ratio of cacheable requests to all…

January 27

Analyze your origin logs to get a higher cache efficiency

If you want to increase the efficiency of your Varnish (or Fastly) cache, you need to figure out what traffic is not cached. By definition, any traffic that reaches your origin is not cached…

December 15

Normalizing the Host Header

In the continued quest to increase cache hit ratios, the chant is: "Normalize, normalize, normalize." Less variation in your requests means you have a higher chance of getting hits. This…

November 11

Overriding Origin TTL in Varnish, or My Beginner's Mistake

A long time ago, I was helping out at a gaming conference where there was an intranet CMS using a Twitter search plugin. Unfortunately, the rather saturated Internet connection was slowing…

October 14

Increase Your Hit Ratio With This Simple Tip

If you're caching URLs that include user input, such as a search box, and the search is case insensitive, there's a really easy way to increase your hit ratio: convert the URL to lowercase.

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