如何使路径“/”不匹配 Golang 中所有其他不匹配的路径 net/http

Question

我正在使用 golang net/http 在 API 中创建一些端点。

我有一个 index 函数映射到 / 路径。我需要任何未明确声明为 mux 至 return 404.

的 path

docs 说：

Note that since a pattern ending in a slash names a rooted subtree, the pattern "/" matches all paths not matched by other registered patterns, not just the URL with Path == "/".

那么，我该怎么做呢？

关注 MRE:

package main

import (
    "fmt"
    "log"
    "net/http"
)

func index(w http.ResponseWriter, req *http.Request) {
    fmt.Fprintln(w, "index")
}

func foo(w http.ResponseWriter, req *http.Request) {
    fmt.Fprintln(w, "foo")
}

func bar(w http.ResponseWriter, req *http.Request) {
    fmt.Fprintln(w, "bar")
}

func main() {

    mux := http.NewServeMux()

    s := &http.Server{
        Addr:    ":8000",
        Handler: mux,
    }

    mux.HandleFunc("/", index)
    mux.HandleFunc("/foo", foo)
    mux.HandleFunc("/bar", bar)

    log.Fatal(s.ListenAndServe())
}

当我运行:

$ curl 'http://localhost:8000/'
index

$ curl 'http://localhost:8000/foo'
foo

$ curl 'http://localhost:8000/bar'
bar

$ curl 'http://localhost:8000/notfoo'
index // Expected 404 page not found

Answer 1

由于您使用的多路复用器会将 / 处理程序与任何未注册的处理程序相匹配，因此您必须在调用 / 路径的处理程序时检查路径：

package main

import (
    "fmt"
    "log"
    "net/http"
)

func index(w http.ResponseWriter, req *http.Request) {
    if req.URL.Path != "/" { // Check path here
       http.NotFound(w, req)
       return
    }
    fmt.Fprintln(w, "index")
}

func foo(w http.ResponseWriter, req *http.Request) {
    fmt.Fprintln(w, "foo")
}

func bar(w http.ResponseWriter, req *http.Request) {
    fmt.Fprintln(w, "bar")
}

func main() {

    mux := http.NewServeMux()

    s := &http.Server{
        Addr:    ":8000",
        Handler: mux,
    }

    mux.HandleFunc("/foo", foo)
    mux.HandleFunc("/bar", bar)
    mux.HandleFunc("/", index)

    log.Fatal(s.ListenAndServe())
}

如何使路径“/”不匹配 Golang 中所有其他不匹配的路径 net/http

How to make path "/" dont match all others not matched paths in Golang net/http

go