diff --git a/internal/oas/oas_client_gen.go b/internal/oas/oas_client_gen.go
index 4c942b7..b19ee1c 100644
--- a/internal/oas/oas_client_gen.go
+++ b/internal/oas/oas_client_gen.go
@@ -21,6 +21,34 @@ import (
 	"github.com/ogen-go/ogen/uri"
 )
 
+// Invoker invokes operations described by OpenAPI v3 specification.
+type Invoker interface {
+	// AddPet invokes addPet operation.
+	//
+	// Add a new pet to the store.
+	//
+	// POST /pet
+	AddPet(ctx context.Context, request *Pet) (*Pet, error)
+	// DeletePet invokes deletePet operation.
+	//
+	// Deletes a pet.
+	//
+	// DELETE /pet/{petId}
+	DeletePet(ctx context.Context, params DeletePetParams) error
+	// GetPetById invokes getPetById operation.
+	//
+	// Returns a single pet.
+	//
+	// GET /pet/{petId}
+	GetPetById(ctx context.Context, params GetPetByIdParams) (GetPetByIdRes, error)
+	// UpdatePet invokes updatePet operation.
+	//
+	// Updates a pet in the store.
+	//
+	// POST /pet/{petId}
+	UpdatePet(ctx context.Context, params UpdatePetParams) error
+}
+
 // Client implements OAS client.
 type Client struct {
 	serverURL *url.URL
diff --git a/internal/oas/oas_router_gen.go b/internal/oas/oas_router_gen.go
index 9a72605..28844d1 100644
--- a/internal/oas/oas_router_gen.go
+++ b/internal/oas/oas_router_gen.go
@@ -10,6 +10,19 @@ import (
 	"github.com/ogen-go/ogen/uri"
 )
 
+func (s *Server) cutPrefix(path string) (string, bool) {
+	prefix := s.cfg.Prefix
+	if prefix == "" {
+		return path, true
+	}
+	if !strings.HasPrefix(path, prefix) {
+		// Prefix doesn't match.
+		return "", false
+	}
+	// Cut prefix from the path.
+	return strings.TrimPrefix(path, prefix), true
+}
+
 // ServeHTTP serves http request as defined by OpenAPI v3 specification,
 // calling handler that matches the path or returning not found error.
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -21,17 +34,9 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			elemIsEscaped = strings.ContainsRune(elem, '%')
 		}
 	}
-	if prefix := s.cfg.Prefix; len(prefix) > 0 {
-		if strings.HasPrefix(elem, prefix) {
-			// Cut prefix from the path.
-			elem = strings.TrimPrefix(elem, prefix)
-		} else {
-			// Prefix doesn't match.
-			s.notFound(w, r)
-			return
-		}
-	}
-	if len(elem) == 0 {
+
+	elem, ok := s.cutPrefix(elem)
+	if !ok || len(elem) == 0 {
 		s.notFound(w, r)
 		return
 	}
@@ -158,6 +163,11 @@ func (s *Server) FindPath(method string, u *url.URL) (r Route, _ bool) {
 		}()
 	}
 
+	elem, ok := s.cutPrefix(elem)
+	if !ok {
+		return r, false
+	}
+
 	// Static code generated router with unwrapped path search.
 	switch {
 	default: