This week’s episode is about Grace mode, Varnish’s interpretation of stale-while-revalidate.

This blog post is part one of a two-part series. (Find part two here.)

Did you know that originally Quentin Tarantino's Kill Bill was supposed to be one four-hour movie? Later, he decided to make it a two-part deal, allowing him to give each part a very different feel and tone. It also happened to George RR Martin with the Storm of Swords book: it grew so big that he eventually had to split it in two volumes, so we don't have to read a 1,300-page book.

How to configure saint mode and grace in Varnish 4.1
A very important feature of Varnish is the ability to deal with misbehaving servers. In this blog I will explain how to properly configure saint mode and grace.

Saint mode and grace have been present since Varnish 2.1, but to make this blog post easier I will cover the differences between Varnish 3 (EOL for real!)  and the current stable Varnish 4.1.