Context

The problem with the previous pattern is that there is no way that you can pass the validated request from one handler to the next without breaking the http.Handler interface, but guess what Go has us covered. The context package was listed as experimental for several years before finally making it in to the standard package with Go 1.7. The Context type implements a safe method for accessing request-scoped data that is safe to use simultaneously by multiple Go routines. Let’s take a quick look at this package and then update our example to see it in use.