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

问题描述

我在Go中遵循简单的web服务器示例。

我插入了一个 log 语句，以便得到的代码如下所示：

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)
}

问题在于，无论何时在我的Web浏览器中加载端口8000，都会调用该函数两次。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。有了这种行为，计数器会增加两次。 OTOH，如果我做 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.

我觉得这真的很愚蠢我在这里失踪。

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

推荐答案

只记录请求。您会意识到您的浏览器也会请求/favicon.ico。

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

请参阅 https://en.wikipedia.org/wiki/Favicon 获取更多信息。

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