Go Middleware Pattern Done Right: HTTP Middleware That Composes

Feildrix

6 min read

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May 11, 2026

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Part of the Go Production Series — a collection of opinionated, battle-tested patterns for building Go services in the real world.

Picture this: your Go API has 12 endpoints. A security audit requires request IDs on every log line. You spend an afternoon adding requestID := uuid.New() to all 12 handlers. Three weeks later, someone asks for latency logging. Another afternoon, another round of copy-paste. Then auth tokens. Then panic recovery.

By endpoint 20, your handlers are doing five things each — none of them business logic.

Middleware is Go’s answer to this problem, and it’s one of the most elegantly designed patterns in the language. But there’s a gap between understanding middleware conceptually and composing it well in production. This article closes that gap.

The Foundation: One Type to Rule Them All

Go’s middleware pattern is built on a single, powerful type signature:

type Middleware func(http.Handler) http.Handler

That’s it. A middleware is a function that takes a handler and returns a new handler. The simplicity is deceptive — this signature is what makes Go…