diff --git a/pkg/serverconfigs/firewallconfigs/http_firewall_checkpoint_definition.go b/pkg/serverconfigs/firewallconfigs/http_firewall_checkpoint_definition.go
index d94cf18..0e4941e 100644
--- a/pkg/serverconfigs/firewallconfigs/http_firewall_checkpoint_definition.go
+++ b/pkg/serverconfigs/firewallconfigs/http_firewall_checkpoint_definition.go
@@ -23,4 +23,5 @@ type HTTPFirewallCheckpointDefinition struct {
 	Options     []OptionInterface `json:"options"`     // 选项
 	IsComposed  bool              `json:"isComposed"`  // 是否为组合的checkpoint
 	Priority    int               `json:"priority"`    // 优先级
+	DataType    string            `json:"dataType"`    // 数据类型：number, bool等
 }
diff --git a/pkg/serverconfigs/firewallconfigs/http_firewall_checkpoints.go b/pkg/serverconfigs/firewallconfigs/http_firewall_checkpoints.go
index 94bcca2..068f17f 100644
--- a/pkg/serverconfigs/firewallconfigs/http_firewall_checkpoints.go
+++ b/pkg/serverconfigs/firewallconfigs/http_firewall_checkpoints.go
@@ -152,6 +152,21 @@ var AllCheckpoints = []*HTTPFirewallCheckpointDefinition{
 		IsRequest:   true,
 		Priority:    100,
 	},
+	{
+		Name:        "CNAME",
+		Prefix:      "cname",
+		Description: "当前网站服务CNAME，比如38b48e4f.goedge.cn",
+		IsRequest:   true,
+		Priority:    100,
+	},
+	{
+		Name:        "是否为CNAME",
+		Prefix:      "isCNAME",
+		Description: "是否为CNAME，值为1（是）或0（否）",
+		IsRequest:   true,
+		Priority:    100,
+		DataType:    "bool",
+	},
 	{
 		Name:        "请求来源URL",
 		Prefix:      "referer",
diff --git a/pkg/serverconfigs/shared/request_variables.go b/pkg/serverconfigs/shared/request_variables.go
index 0d9f8be..1742707 100644
--- a/pkg/serverconfigs/shared/request_variables.go
+++ b/pkg/serverconfigs/shared/request_variables.go
@@ -25,6 +25,7 @@ func DefaultRequestVariables() []maps.Map {
 		{"code": "${msec}", "name": "带有毫秒的时间", "description": "比如1531756823.054"},
 		{"code": "${timestamp}", "name": "unix时间戳，单位为秒", "description": ""},
 		{"code": "${host}", "name": "主机名", "description": ""},
+		{"code": "${cname}", "name": "当前网站的CNAME", "description": "比如38b48e4f.goedge.cn"},
 		{"code": "${serverName}", "name": "接收请求的服务器名", "description": ""},
 		{"code": "${serverPort}", "name": "接收请求的服务器端口", "description": ""},
 		{"code": "${referer}", "name": "请求来源URL", "description": ""},