diff --git a/proxy/proxy_test.go b/proxy/proxy_test.go
index ae5ad25..11fd21a 100644
--- a/proxy/proxy_test.go
+++ b/proxy/proxy_test.go
@@ -250,7 +250,7 @@ func TestProxyFactory(t *testing.T) {
 	}
 
 	dummyProxyFactory := proxy.FactoryFunc(func(_ *config.EndpointConfig) (proxy.Proxy, error) {
-		return func(ctx context.Context, req *proxy.Request) (*proxy.Response, error) {
+		return func(_ context.Context, req *proxy.Request) (*proxy.Response, error) {
 			if req.Method != "POST" {
 				t.Errorf("unexpected method %s", req.Method)
 			}
@@ -446,7 +446,7 @@ func Test_Issue7(t *testing.T) {
 	json.Unmarshal([]byte(response), &r)
 
 	dummyProxyFactory := proxy.FactoryFunc(func(_ *config.EndpointConfig) (proxy.Proxy, error) {
-		return func(ctx context.Context, req *proxy.Request) (*proxy.Response, error) {
+		return func(_ context.Context, _ *proxy.Request) (*proxy.Response, error) {
 			return &proxy.Response{
 				Data: r,
 				Metadata: proxy.Metadata{
@@ -518,7 +518,7 @@ func Test_jsonNumber(t *testing.T) {
 	encoding.JSONDecoder(strings.NewReader(response), &r)
 
 	dummyProxyFactory := proxy.FactoryFunc(func(_ *config.EndpointConfig) (proxy.Proxy, error) {
-		return func(ctx context.Context, req *proxy.Request) (*proxy.Response, error) {
+		return func(_ context.Context, _ *proxy.Request) (*proxy.Response, error) {
 			return &proxy.Response{
 				Data: r,
 				Metadata: proxy.Metadata{
@@ -594,7 +594,7 @@ func Test_keyValConverter(t *testing.T) {
 	}
 
 	dummyProxyFactory := proxy.FactoryFunc(func(_ *config.EndpointConfig) (proxy.Proxy, error) {
-		return func(ctx context.Context, req *proxy.Request) (*proxy.Response, error) {
+		return func(_ context.Context, _ *proxy.Request) (*proxy.Response, error) {
 			return &proxy.Response{
 				Data: r,
 				Metadata: proxy.Metadata{
@@ -674,7 +674,7 @@ func Test_listGrowsWhenUpperIndexOutOfBound(t *testing.T) {
 	r := map[string]interface{}{}
 
 	dummyProxyFactory := proxy.FactoryFunc(func(_ *config.EndpointConfig) (proxy.Proxy, error) {
-		return func(ctx context.Context, req *proxy.Request) (*proxy.Response, error) {
+		return func(_ context.Context, _ *proxy.Request) (*proxy.Response, error) {
 			return &proxy.Response{
 				Data: r,
 				Metadata: proxy.Metadata{
diff --git a/router/gin/lua_test.go b/router/gin/lua_test.go
index 5c7d465..0be603d 100644
--- a/router/gin/lua_test.go
+++ b/router/gin/lua_test.go
@@ -98,7 +98,7 @@ func TestHandlerFactory_error(t *testing.T) {
 	}
 
 	hf := func(_ *config.EndpointConfig, _ proxy.Proxy) gin.HandlerFunc {
-		return func(c *gin.Context) {
+		return func(_ *gin.Context) {
 			t.Error("the handler shouldn't be executed")
 		}
 	}
@@ -131,7 +131,7 @@ func TestHandlerFactory_errorHTTP(t *testing.T) {
 	}
 
 	hf := func(_ *config.EndpointConfig, _ proxy.Proxy) gin.HandlerFunc {
-		return func(c *gin.Context) {
+		return func(_ *gin.Context) {
 			t.Error("the handler shouldn't be executed")
 		}
 	}
@@ -164,7 +164,7 @@ func TestHandlerFactory_errorHTTPWithContentType(t *testing.T) {
 	}
 
 	hf := func(_ *config.EndpointConfig, _ proxy.Proxy) gin.HandlerFunc {
-		return func(c *gin.Context) {
+		return func(_ *gin.Context) {
 			t.Error("the handler shouldn't be executed")
 		}
 	}
diff --git a/router/mux/lua_test.go b/router/mux/lua_test.go
index 6fbb0df..d0fefa8 100644
--- a/router/mux/lua_test.go
+++ b/router/mux/lua_test.go
@@ -33,7 +33,7 @@ func TestHandlerFactory(t *testing.T) {
 	}
 
 	hf := func(_ *config.EndpointConfig, _ proxy.Proxy) http.HandlerFunc {
-		return func(w http.ResponseWriter, r *http.Request) {
+		return func(_ http.ResponseWriter, r *http.Request) {
 			if URL := r.URL.String(); URL != "/some-path/42?extra=foo&id=1&more=true" {
 				t.Errorf("unexpected URL: %s", URL)
 			}
@@ -89,7 +89,7 @@ func TestHandlerFactory_error(t *testing.T) {
 	}
 
 	hf := func(_ *config.EndpointConfig, _ proxy.Proxy) http.HandlerFunc {
-		return func(w http.ResponseWriter, r *http.Request) {
+		return func(_ http.ResponseWriter, _ *http.Request) {
 			t.Error("the handler shouldn't be executed")
 		}
 	}
@@ -120,7 +120,7 @@ func TestHandlerFactory_errorHTTP(t *testing.T) {
 	}
 
 	hf := func(_ *config.EndpointConfig, _ proxy.Proxy) http.HandlerFunc {
-		return func(w http.ResponseWriter, r *http.Request) {
+		return func(_ http.ResponseWriter, _ *http.Request) {
 			t.Error("the handler shouldn't be executed")
 		}
 	}
@@ -151,7 +151,7 @@ func TestHandlerFactory_errorHTTPWithContentType(t *testing.T) {
 	}
 
 	hf := func(_ *config.EndpointConfig, _ proxy.Proxy) http.HandlerFunc {
-		return func(w http.ResponseWriter, r *http.Request) {
+		return func(_ http.ResponseWriter, _ *http.Request) {
 			t.Error("the handler shouldn't be executed")
 		}
 	}