add customized user-agent

config_sample.json

@@ -20,6 +20,7 @@
   ],
   "ip_url": "https://myip.biturl.top",
   "interval": 300,
+  "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.111 Safari/537.36",
   "ip_interface": "eth0",
   "socks5_proxy": "",
   "notify": {

handler/google/google_handler.go

@@ -82,8 +82,12 @@ func (handler *Handler) UpdateIP(domain, subDomain, currentIP string) {
 	values.Add("myip", currentIP)
 
 	client := godns.GetHttpClient(handler.Configuration)
-
 	req, _ := http.NewRequest("POST", GoogleUrl, strings.NewReader(values.Encode()))
+
+	if handler.Configuration.UserAgent != "" {
+		req.Header.Add("User-Agent", handler.Configuration.UserAgent)
+	}
+
 	resp, err := client.Do(req)
 
 	if err != nil {

settings.go

@@ -31,6 +31,7 @@ type Settings struct {
 	Domains     []Domain `json:"domains"`
 	IPUrl       string   `json:"ip_url"`
 	Interval    int      `json:"interval"`
+	UserAgent   string   `json:"user_agent,omitempty"`
 	LogPath     string   `json:"log_path"`
 	Socks5Proxy string   `json:"socks5_proxy"`
 	Notify      Notify   `json:"notify"`