Why the closest geographical path on the internet isn't always the fastest

Why the closest geographical path on the internet isn't always the fastest

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Dejan Grofelnik Pelzel
Dejan Grofelnik Pelzel
January 14th, 2021

From time to time, we get asked why we route a certain country or region to a PoP that's not geographically closest to the end-user. After all, that's what CDNs are all about, accelerating content and caching on the edge.The answer is pretty simple, but to und…

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Protecting Against CDN Cache Poisoning

Protecting Against CDN Cache Poisoning

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Dejan Grofelnik Pelzel
Dejan Grofelnik Pelzel
August 31st, 2020

Recently, a new type of denial of service attack has surfaced that directly target CDNs. The so called cache poisoning attack works by poisoning the responses cached from the origin server.What is cache poisoning and how does it work? Generally a CDN works by…

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Why HTTP/2 Domain Sharding Might Actually Be Hurting Your Performance

Why HTTP/2 Domain Sharding Might Actually Be Hurting Your Performance

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Dejan Grofelnik Pelzel
Dejan Grofelnik Pelzel
December 26th, 2017

In the past, browsers had a limit of downloading a single request per connection. On top of that, browsers would limit the number of connections per hostname to prevent excessive load on the computers and server. This meant that for each request, the browser w…

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Speed Up Your CDN With DNS Prefetch

Speed Up Your CDN With DNS Prefetch

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Dejan Grofelnik Pelzel
Dejan Grofelnik Pelzel
May 14th, 2016

There's a neat little trick that allows you to squeeze an extra few milliseconds by pre-fetching your CDN hostnames in the HTML head section using a simple HTML5 tag. What this does is it tells the browser to start resolving the hostname immediately after the…

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4 Reasons To Always Use A Custom Subdomain Hostname For Your CDN URLs

4 Reasons To Always Use A Custom Subdomain Hostname For Your CDN URLs

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Dejan Grofelnik Pelzel
Dejan Grofelnik Pelzel
November 2nd, 2015

Most CDNs will give you an option to either stick with their own subdomain names or use your own domain name to serve your content. In this post I will describe 4 reasons you should always try to use a custom CDN hostname if possible.Branding & Professiona…

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