Fix the type of request.Form in 04.1

de/04.1.md

@@ -55,7 +55,7 @@ This is easy to find out using the `http` package. Let's see how to handle the f
 			fmt.Println("password:", r.Form["password"])
 		}
 	}
-		
+
 	func main() {
 		http.HandleFunc("/", sayhelloName) // setting router rule
 		http.HandleFunc("/login", login)
@@ -84,9 +84,9 @@ Try changing the value of the action in the form `http://127.0.0.1:9090/login` t
 
 ![](images/4.1.slice.png?raw=true)
 
-Figure 4.2 Server prints request data 
+Figure 4.2 Server prints request data
 
-The type of `request.Form` is `url.Value`. It saves data with the format `key=value`.
+The type of `request.Form` is `url.Values`. It saves data with the format `key=value`.
 
 	v := url.Values{}
 	v.Set("name", "Ava")