HandleFunc 被调用两次 [英] HandleFunc being called twice

问题描述

我正在使用 Go 中的简单网络服务器示例.

I am following a simple web server example in Go.

我插入了一个 log 语句，结果代码如下所示:

I inserted a log statement so that the resulting code looks like below:

package main

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

func hello(w http.ResponseWriter, r *http.Request) {
    io.WriteString(w, "Hello world!")
    log.Println("hello.")
}

func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/", hello)
    http.ListenAndServe(":8000", mux)
}

问题是，每当我在 Web 浏览器中加载端口 8000 时，此函数都会被调用两次.这是一个问题，因为我打算在每次访问页面时增加一个计数器.通过这种行为，计数器会增加两次.OTOH，如果我执行curl localhost:8000，它只会被调用一次.

Problem is that whenever I load port 8000 in my web browser, this function is called twice. This is an issue because I intend to increment a counter on each page visit. With this behavior, counter gets incremented twice. OTOH, if I do curl localhost:8000, it is called only once.

我觉得我在这里错过了一些非常愚蠢的事情.

I feel it's something really silly that I am missing here.

推荐答案

只需记录请求.您会发现您的浏览器也请求/favicon.ico.

Just log the requests. You will realize that your browser also requests /favicon.ico.

有关详细信息，请参阅 https://en.wikipedia.org/wiki/Favicon.

See https://en.wikipedia.org/wiki/Favicon for more information.

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