How to nest routers in Go julienschmidt/httprouter?

php Xiaobian Yuzai brings you a concise guide on using julienschmidt/httprouter nested routers in the Go language. julienschmidt/httprouter is a lightweight, high-performance HTTP request router that can help us better organize and manage routing. This article will introduce in detail how to use julienschmidt/httprouter in Go language to implement the function of nested routers to better meet complex routing requirements. Whether you are a beginner or an experienced developer, this article will provide you with easy-to-follow steps and sample code to help you easily master the use of nested routers. Let’s get started!

Question content

I want to expose the following url from my service:

get /api/foo
get /api/bar

I also want to structure this as a router nested within another router. The top-level router will match all requests to /api and serve them using a nested router that will match requests to /foo and /bar request. Basically, namespaces.

I can have just one router and provide /api prefix for both routes:

router.get("/api/foo", apifoo)
router.get("/api/bar", apibar)

But I want to use a single router for all routes within the /api prefix so that I can add the appropriate middleware to them with a single function call.

This is what I tried:

package main

import (
    "log"
    "net/http"

    "github.com/julienschmidt/httprouter"
)

func apiFoo(w http.ResponseWriter, r *http.Request) {}
func apiBar(w http.ResponseWriter, r *http.Request) {}

func main() {
    api := httprouter.New()
    api.HandlerFunc(http.MethodGet, "/foo", apiFoo)
    api.HandlerFunc(http.MethodGet, "/bar", apiBar)

    router := httprouter.New()
    router.Handler(http.MethodGet, "/api", api)

    log.Fatal(http.ListenAndServe(":8080", router))
}

However, 404 not found when accessing http://localhost:8080/api/foo or http://localhost:8080/api/bar

I thought nested routers would work because routers implement the http.handler interface. What did I miss?

Workaround

httprouter doesn't concatenate paths, so you can't do that. Both routers will simply examine the request path and act accordingly.

There is a 7 year old public pull request that could make it happen. You can look there and implement similar logic yourself, PR based on the connection path. Maybe you could write a small helper function for this.

If you are willing to switch router packages, you may consider alternatives such as chi, which support router groups.

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