diff --git a/include/cinatra/client_factory.hpp b/include/cinatra/client_factory.hpp
index e2007d73..4856bb9a 100644
--- a/include/cinatra/client_factory.hpp
+++ b/include/cinatra/client_factory.hpp
@@ -44,12 +44,14 @@ namespace cinatra {
 
 	template<res_content_type CONTENT_TYPE = res_content_type::json, size_t TIMEOUT = 3000, http_method METHOD = POST>
 	inline std::string send_msg(std::string ip, std::string api, std::string msg) {
+		assert(!api.empty() && api[0] == '/');
 		auto client = client_factory::instance().new_client(std::move(ip), "http");
 		return client->send_msg<CONTENT_TYPE>(std::move(api), std::move(msg));
 	}
 
 	template<res_content_type CONTENT_TYPE = res_content_type::json, size_t TIMEOUT = 3000, http_method METHOD = POST>
 	inline std::string send_msg(std::string ip, std::string port, std::string api, std::string msg) {
+		assert(!api.empty() && api[0] == '/');
 		auto client = client_factory::instance().new_client(std::move(ip), std::move(port));
 		return client->send_msg<CONTENT_TYPE>(std::move(api), std::move(msg));
 	}