URL验证似乎已损坏

Question

I'm trying to validate a URL using Go's standard library. This is what my code currently looks like.

import (
    "fmt"
    "net/url"
)

func isValidURL(tocheck string) bool {
    _, err := url.ParseRequestURI(tocheck)
    return err == nil
}

func main() {
    fmt.Println(isValidURL("google.com"))      //returns false, expected true
    fmt.Println(isValidURL("www.google.com"))  //returns false, expected true
    fmt.Println(isValidURL("google"))          //returns false, expected false
    fmt.Println(isValidURL("/google"))         //returns true, expected false
}

All three examples print false, even though the first two should be true. I then tried appending https:// to the beginning of URLs that don't start with them, but then everything, like https://aaaa is parsed as valid. What can I do to make sure it only returns true when the URL is actually valid?

Answer 1

You have confused domains with URLs, the domain is only a part of the URL.

Valid domain examples are: www.google.com, localhost and a.b.c.a.google.com.

In order for a URL to be valid the scheme/protocol part (normally https://) must be there, see syntax at Wikipedia for an easy explanation.

http://aaa is a valid URL by the same rules as http://localhost is valid