diff --git a/server.go b/server.go
index 08f054f..ce99381 100644
--- a/server.go
+++ b/server.go
@@ -222,6 +222,22 @@ func timestampOldThan(ts int32, sec int32) bool {
 	return diff > sec
 }
 
+func buildSignature(token string) (signature, timestamp, nonce string) {
+	timestamp = fmt.Sprintf("%d", int32(time.Now().Unix()))
+	nonce = "1461107899" //a randome string cut from previous wechat request
+	signature = calculateSignature(timestamp, nonce, token)
+	return
+}
+
+func buildReqCommonSignature(req *http.Request, token string) {
+	signature, timestamp, nonce := buildSignature(token)
+	q := req.URL.Query()
+	q.Add("signature", signature)
+	q.Add("timestamp", timestamp)
+	q.Add("nonce", nonce)
+	req.URL.RawQuery = q.Encode()
+}
+
 // func checkSignature1() bool {
 // 	s1 := "e39de9f2e28079c01ebb4b803dfc3442b819545c"
 // 	t1 := "1492970761"
diff --git a/server_test.go b/server_test.go
index 8747d0a..240eeef 100644
--- a/server_test.go
+++ b/server_test.go
@@ -257,21 +257,7 @@ func buildReqTmpQr(val, expire int32) *http.Request {
 	return req
 }
 
-func buildSignature(token string) (signature, timestamp, nonce string) {
-	timestamp = fmt.Sprintf("%d", int32(time.Now().Unix()))
-	nonce = "1461107899" //a randome string cut from previous wechat request
-	signature = calculateSignature(timestamp, nonce, token)
-	return
-}
 
-func buildReqCommonSignature(req *http.Request, token string) {
-	signature, timestamp, nonce := buildSignature(token)
-	q := req.URL.Query()
-	q.Add("signature", signature)
-	q.Add("timestamp", timestamp)
-	q.Add("nonce", nonce)
-	req.URL.RawQuery = q.Encode()
-}
 
 func buildReqCommonHeader(r *http.Request) {
 	//