如何在处理函数func中使用http.Get请求

How to make http.Get request inside of handler func? For example, this simple code "should" return blank page in localhost:8080 browser but it go nuts. What I have missed in school?

package main

import "net/http"

func index(w http.ResponseWriter, r *http.Request) {
    _, err := http.Get("www.google.com")
    if err != nil {
        panic(err)
    }
}

func main() {
    http.HandleFunc("/", index)
    http.ListenAndServe(":8080", nil)
}

The problem is that you should use a protocol (e.g. https://) in the Get function:

_, err := http.Get("https://www.google.com")

The error in you original code is Get www.google.com: unsupported protocol scheme "".

http.Get() expects a URL, and www.google.com is not a URL; a URL begins with a scheme. Even though it is common to type "www.google.com" into a browser, it's still not a full URL; friendly browsers automatically prepend "http://" or "https://" before issuing the request. http.Get() isn't going to do that; it expects a well-formed URL to begin with.