diff --git a/modules/openapi-generator/src/main/resources/go-server/controller-api.mustache b/modules/openapi-generator/src/main/resources/go-server/controller-api.mustache
index 30e4cfba7cba..448eee3ff760 100644
--- a/modules/openapi-generator/src/main/resources/go-server/controller-api.mustache
+++ b/modules/openapi-generator/src/main/resources/go-server/controller-api.mustache
@@ -183,6 +183,10 @@ func (c *{{classname}}Controller) {{nickname}}(w http.ResponseWriter, r *http.Re
 	{{^isDateTime}}
 	{{^isEnumOrRef}}
 	{{paramName}}Param := {{#routers}}{{#mux}}params["{{baseName}}"]{{/mux}}{{#chi}}chi.URLParam(r, "{{baseName}}"){{/chi}}{{/routers}}
+	if {{paramName}}Param == "" {
+		c.errorHandler(w, r, &RequiredError{"{{baseName}}"}, nil)
+		return
+	}
 	{{/isEnumOrRef}}
 	{{#isEnumOrRef}}
 	{{paramName}}Param, err := New{{dataType}}FromValue({{#routers}}{{#mux}}params["{{baseName}}"]{{/mux}}{{#chi}}chi.URLParam(r, "{{baseName}}"){{/chi}}{{/routers}})
diff --git a/samples/openapi3/server/petstore/go/go-petstore/go/api_store.go b/samples/openapi3/server/petstore/go/go-petstore/go/api_store.go
index 7b131249078c..3a2d0a3032b9 100644
--- a/samples/openapi3/server/petstore/go/go-petstore/go/api_store.go
+++ b/samples/openapi3/server/petstore/go/go-petstore/go/api_store.go
@@ -76,6 +76,10 @@ func (c *StoreAPIController) Routes() Routes {
 // DeleteOrder - Delete purchase order by ID
 func (c *StoreAPIController) DeleteOrder(w http.ResponseWriter, r *http.Request) {
 	orderIdParam := chi.URLParam(r, "orderId")
+	if orderIdParam == "" {
+		c.errorHandler(w, r, &RequiredError{"orderId"}, nil)
+		return
+	}
 	result, err := c.service.DeleteOrder(r.Context(), orderIdParam)
 	// If an error occurred, encode the error with the status code
 	if err != nil {
diff --git a/samples/openapi3/server/petstore/go/go-petstore/go/api_user.go b/samples/openapi3/server/petstore/go/go-petstore/go/api_user.go
index 88a9e8643e22..405b26523d70 100644
--- a/samples/openapi3/server/petstore/go/go-petstore/go/api_user.go
+++ b/samples/openapi3/server/petstore/go/go-petstore/go/api_user.go
@@ -174,6 +174,10 @@ func (c *UserAPIController) CreateUsersWithListInput(w http.ResponseWriter, r *h
 func (c *UserAPIController) DeleteUser(w http.ResponseWriter, r *http.Request) {
 	query := r.URL.Query()
 	usernameParam := chi.URLParam(r, "username")
+	if usernameParam == "" {
+		c.errorHandler(w, r, &RequiredError{"username"}, nil)
+		return
+	}
 	booleanTestParam, err := parseBoolParameter(
 		query.Get("boolean_test"),
 		WithParse[bool](parseBool),
@@ -195,6 +199,10 @@ func (c *UserAPIController) DeleteUser(w http.ResponseWriter, r *http.Request) {
 // GetUserByName - Get user by user name
 func (c *UserAPIController) GetUserByName(w http.ResponseWriter, r *http.Request) {
 	usernameParam := chi.URLParam(r, "username")
+	if usernameParam == "" {
+		c.errorHandler(w, r, &RequiredError{"username"}, nil)
+		return
+	}
 	result, err := c.service.GetUserByName(r.Context(), usernameParam)
 	// If an error occurred, encode the error with the status code
 	if err != nil {
@@ -275,6 +283,10 @@ func (c *UserAPIController) LogoutUser(w http.ResponseWriter, r *http.Request) {
 // UpdateUser - Updated user
 func (c *UserAPIController) UpdateUser(w http.ResponseWriter, r *http.Request) {
 	usernameParam := chi.URLParam(r, "username")
+	if usernameParam == "" {
+		c.errorHandler(w, r, &RequiredError{"username"}, nil)
+		return
+	}
 	userParam := User{}
 	d := json.NewDecoder(r.Body)
 	d.DisallowUnknownFields()
diff --git a/samples/server/petstore/go-api-server/go/api_store.go b/samples/server/petstore/go-api-server/go/api_store.go
index df87b17defa6..a9cf01dd74ef 100644
--- a/samples/server/petstore/go-api-server/go/api_store.go
+++ b/samples/server/petstore/go-api-server/go/api_store.go
@@ -77,6 +77,10 @@ func (c *StoreAPIController) Routes() Routes {
 func (c *StoreAPIController) DeleteOrder(w http.ResponseWriter, r *http.Request) {
 	params := mux.Vars(r)
 	orderIdParam := params["orderId"]
+	if orderIdParam == "" {
+		c.errorHandler(w, r, &RequiredError{"orderId"}, nil)
+		return
+	}
 	result, err := c.service.DeleteOrder(r.Context(), orderIdParam)
 	// If an error occurred, encode the error with the status code
 	if err != nil {
diff --git a/samples/server/petstore/go-api-server/go/api_user.go b/samples/server/petstore/go-api-server/go/api_user.go
index 966c5e6ceb69..04e30486e0ba 100644
--- a/samples/server/petstore/go-api-server/go/api_user.go
+++ b/samples/server/petstore/go-api-server/go/api_user.go
@@ -175,6 +175,10 @@ func (c *UserAPIController) DeleteUser(w http.ResponseWriter, r *http.Request) {
 	params := mux.Vars(r)
 	query := r.URL.Query()
 	usernameParam := params["username"]
+	if usernameParam == "" {
+		c.errorHandler(w, r, &RequiredError{"username"}, nil)
+		return
+	}
 	booleanTestParam, err := parseBoolParameter(
 		query.Get("boolean_test"),
 		WithParse[bool](parseBool),
@@ -197,6 +201,10 @@ func (c *UserAPIController) DeleteUser(w http.ResponseWriter, r *http.Request) {
 func (c *UserAPIController) GetUserByName(w http.ResponseWriter, r *http.Request) {
 	params := mux.Vars(r)
 	usernameParam := params["username"]
+	if usernameParam == "" {
+		c.errorHandler(w, r, &RequiredError{"username"}, nil)
+		return
+	}
 	result, err := c.service.GetUserByName(r.Context(), usernameParam)
 	// If an error occurred, encode the error with the status code
 	if err != nil {
@@ -246,6 +254,10 @@ func (c *UserAPIController) LogoutUser(w http.ResponseWriter, r *http.Request) {
 func (c *UserAPIController) UpdateUser(w http.ResponseWriter, r *http.Request) {
 	params := mux.Vars(r)
 	usernameParam := params["username"]
+	if usernameParam == "" {
+		c.errorHandler(w, r, &RequiredError{"username"}, nil)
+		return
+	}
 	userParam := User{}
 	d := json.NewDecoder(r.Body)
 	d.DisallowUnknownFields()
diff --git a/samples/server/petstore/go-chi-server/go/api_store.go b/samples/server/petstore/go-chi-server/go/api_store.go
index 7b131249078c..3a2d0a3032b9 100644
--- a/samples/server/petstore/go-chi-server/go/api_store.go
+++ b/samples/server/petstore/go-chi-server/go/api_store.go
@@ -76,6 +76,10 @@ func (c *StoreAPIController) Routes() Routes {
 // DeleteOrder - Delete purchase order by ID
 func (c *StoreAPIController) DeleteOrder(w http.ResponseWriter, r *http.Request) {
 	orderIdParam := chi.URLParam(r, "orderId")
+	if orderIdParam == "" {
+		c.errorHandler(w, r, &RequiredError{"orderId"}, nil)
+		return
+	}
 	result, err := c.service.DeleteOrder(r.Context(), orderIdParam)
 	// If an error occurred, encode the error with the status code
 	if err != nil {
diff --git a/samples/server/petstore/go-chi-server/go/api_user.go b/samples/server/petstore/go-chi-server/go/api_user.go
index 6401d90e4c41..6dc16a801e42 100644
--- a/samples/server/petstore/go-chi-server/go/api_user.go
+++ b/samples/server/petstore/go-chi-server/go/api_user.go
@@ -174,6 +174,10 @@ func (c *UserAPIController) CreateUsersWithListInput(w http.ResponseWriter, r *h
 func (c *UserAPIController) DeleteUser(w http.ResponseWriter, r *http.Request) {
 	query := r.URL.Query()
 	usernameParam := chi.URLParam(r, "username")
+	if usernameParam == "" {
+		c.errorHandler(w, r, &RequiredError{"username"}, nil)
+		return
+	}
 	booleanTestParam, err := parseBoolParameter(
 		query.Get("boolean_test"),
 		WithParse[bool](parseBool),
@@ -195,6 +199,10 @@ func (c *UserAPIController) DeleteUser(w http.ResponseWriter, r *http.Request) {
 // GetUserByName - Get user by user name
 func (c *UserAPIController) GetUserByName(w http.ResponseWriter, r *http.Request) {
 	usernameParam := chi.URLParam(r, "username")
+	if usernameParam == "" {
+		c.errorHandler(w, r, &RequiredError{"username"}, nil)
+		return
+	}
 	result, err := c.service.GetUserByName(r.Context(), usernameParam)
 	// If an error occurred, encode the error with the status code
 	if err != nil {
@@ -243,6 +251,10 @@ func (c *UserAPIController) LogoutUser(w http.ResponseWriter, r *http.Request) {
 // UpdateUser - Updated user
 func (c *UserAPIController) UpdateUser(w http.ResponseWriter, r *http.Request) {
 	usernameParam := chi.URLParam(r, "username")
+	if usernameParam == "" {
+		c.errorHandler(w, r, &RequiredError{"username"}, nil)
+		return
+	}
 	userParam := User{}
 	d := json.NewDecoder(r.Body)
 	d.DisallowUnknownFields()