转到：表示没有查询字符串的路径

How do I represent a path without query string?

Eg.:

• www.example.com/user instead of
• www.example.com/user?id=1

The following code didn't work:

Go:

if r.URL.Path[4:] != "" {
    //do something
}

To add parameters to an url, you would use Values().

That means, an URL without any parameters would have its 'Values' length set to 0:

if len(r.URL.Query()) == 0 {
}

That should be the same as the r.URL.RawQuery suggested by Dewy Broto in the comments:

if r.URL.RawQuery == "" {
}

Or you can check for the presence if the key 'id' in the Values() map.

if r.URL.Query().Get("id") == "" {
   //do something here
}

func main() {
    req, err := http.NewRequest("GET", "http://www.example.com/user?id=1", nil)
    if err != nil {
        log.Fatal(err)
    }

    // get host
    fmt.Printf("%v
", req.Host) // Output: www.example.com

    // path without query string
    fmt.Printf("%v
", req.URL.Path) // Output: /user

    // get query string value by key
    fmt.Printf("%v
", req.URL.Query().Get("id")) // Output: 1

    // raw query string
    fmt.Printf("%v
", req.URL.RawQuery) // Output: id=1
}

Go play