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For the values assigned to each variable: R/W is “Read and Write”, and R is “Read” and W is “Write” It’s important to realise that the above matrix is based on Varnish and not Fastly’s version of Varnish. But there’s only one difference between them, which is the response object resp isn’t available within vcl_error when using Fastly. When you’re dealing with vcl_recv you pretty much only ever int

Analysis Steps Regardless of the tool you use for analysis, a general rule of thumb is to: Identify a bottleneck at a high-level For example, you might notice a long running function call. Reduce the operations Look at time spent, or number of calls, and figure out an alternative approach. Look at the number of memory allocations, figure out an alternative approach. Drill down Use a tool that give

HTTP/2TOC Introduction This is a super quick post for demonstrating how to utilise the new HTTP/2 protocol. If you’re unfamiliar with it, then let me spend a brief few moments discussing some of the highlights. Persistent Connections When using HTTP/1.x each resource your web page specified would need its own connection. If you had three images on a page then that would be three separate connectio

Refactoring TechniquesTOC Introduction Let’s begin by considering: “What is Refactoring?” The definition of refactoring is: a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behaviour Refactoring is a term originated from the Smalltalk community of developers back in the mid-late nineties. Two of the most prolific prog