package main import ( "encoding/base64" "fmt" ) func main() { b := []byte("Hello, セカイ") s1 := base64.StdEncoding.EncodeToString(b) fmt.Println(s1) // SGVsbG8sIOOCu+OCq+OCpA== s2 := base64.URLEncoding.EncodeToString(b) fmt.Println(s2) // SGVsbG8sIOOCu-OCq-OCpA== s3 := base64.RawStdEncoding.EncodeToString(b) fmt.Println(s3) // SGVsbG8sIOOCu+OCq+OCpA s4 := base64.RawURLEncoding.EncodeToString(b) fmt.