Building Microservices with Go

TimeoutHandler

The TimeoutHandler function returns a Handler interface that runs h with the given time limit. When we investigate common patterns in Chapter 6, Microservice Frameworks, we will see just how useful this can be for avoiding cascading failures in your service:

func TimeoutHandler(h Handler, dt time.Duration, msg string) Handler 

The new handler calls h.ServeHTTP to handle each request, but if a call runs for longer than its time limit, the handler responds with a 503 Service Unavailable response with the given message (msg) in its body.

The last two handlers are especially interesting as they are, in effect, chaining handlers. This is a technique that we will go into more in-depth in a later chapter as it allows you to both practice ...