diff --git a/examples/example_guestbook.cpp b/examples/example_guestbook.cpp
index 453cd2c..aa16022 100644
--- a/examples/example_guestbook.cpp
+++ b/examples/example_guestbook.cpp
@@ -17,7 +17,7 @@ struct RouteContext {
 
 template<>
 struct asyncgi::config::RouteMatcher<AccessRole, RouteContext> {
-    bool operator()(AccessRole value, const asyncgi::Request&, asyncgi::Response&, RouteContext& context) const
+    bool operator()(AccessRole value, const asyncgi::Request&, const RouteContext& context) const
     {
         return value == context.role;
     }
diff --git a/examples/example_route_matcher.cpp b/examples/example_route_matcher.cpp
index 9361a66..122a058 100644
--- a/examples/example_route_matcher.cpp
+++ b/examples/example_route_matcher.cpp
@@ -51,7 +51,7 @@ struct LoginPageAuthorize {
 
 template<>
 struct asyncgi::config::RouteMatcher<AccessRole, RouteContext> {
-    bool operator()(AccessRole value, const asyncgi::Request&, asyncgi::Response&, RouteContext& context) const
+    bool operator()(AccessRole value, const asyncgi::Request&, const RouteContext& context) const
     {
         return value == context.role;
     }
diff --git a/include/asyncgi/router.h b/include/asyncgi/router.h
index 058d24c..271c6e3 100755
--- a/include/asyncgi/router.h
+++ b/include/asyncgi/router.h
@@ -113,7 +113,7 @@ class Router : public whaleroute::RequestRouter<Request, Response, detail::Respo
 
 template<>
 struct config::RouteMatcher<asyncgi::http::RequestMethod> {
-    bool operator()(asyncgi::http::RequestMethod value, const asyncgi::Request& request, asyncgi::Response&) const
+    bool operator()(asyncgi::http::RequestMethod value, const asyncgi::Request& request) const
     {
         return value == request.method();
     }
@@ -121,8 +121,7 @@ struct config::RouteMatcher<asyncgi::http::RequestMethod> {
 
 template<typename TContext>
 struct config::RouteMatcher<asyncgi::http::RequestMethod, TContext> {
-    bool operator()(asyncgi::http::RequestMethod value, const asyncgi::Request& request, asyncgi::Response&, TContext&)
-            const
+    bool operator()(asyncgi::http::RequestMethod value, const asyncgi::Request& request, const TContext&) const
     {
         return value == request.method();
     }