diff --git a/rpc.go b/rpc.go
index a5ca01e..c7de2c9 100644
--- a/rpc.go
+++ b/rpc.go
@@ -105,7 +105,7 @@ func (r *request) GetServiceInfo(serviceFlag string) (*Service, error) {
 	)
 
 	r.lock.RLock()
-	defer r.lock.Unlock()
+	defer r.lock.RUnlock()
 	if serviceInfo, exist = r.serviceTable[serviceFlag]; !exist {
 		return nil, errors.New(serviceFlag + " -> 服务不存在")
 	}
@@ -176,8 +176,8 @@ func (r *request) GetServiceApi(serviceFlag string, apiFlag string) (*Service, *
 	if serviceInfo, err = r.GetServiceInfo(serviceFlag); nil != err {
 		return nil, nil, err
 	}
-	r.lock.Lock()
-	defer r.lock.Unlock()
+	r.lock.RLock()
+	defer r.lock.RUnlock()
 	if apiInfo, exist = serviceInfo.ApiTable[apiFlag]; !exist {
 		return nil, nil, errors.New(serviceFlag + " : " + apiFlag + " -> api")
 	}
@@ -311,6 +311,9 @@ func (r *request) getFullURLAndBody(serviceConfig *Service, apiConfig *Api, para
 	case http.MethodDelete:
 		body, _ = json.Marshal(parameter)
 	}
+	if nil == body {
+		body = []byte("{}")
+	}
 	query := strings.Join(parameterPair, "&")
 	if len(query) == 0 {
 		return strings.ReplaceAll(fullURL, "//", "/"), body