v0.5.0-rc5: added proxy.exclude label, refactored some code

src/common/env.go

@@ -2,17 +2,13 @@ package common
 
 import (
 	"os"
-	"strings"
+
+	U "github.com/yusing/go-proxy/utils"
 )
 
 var NoSchemaValidation = getEnvBool("GOPROXY_NO_SCHEMA_VALIDATION")
 var IsDebug = getEnvBool("GOPROXY_DEBUG")
 
 func getEnvBool(key string) bool {
-	switch strings.ToLower(os.Getenv(key)) {
-	case "1", "true", "yes", "on":
-		return true
-	default:
-		return false
-	}
+	return U.ParseBool(os.Getenv(key))
 }