diff --git a/client.go b/client.go
index 2c2b0aa..c0828f0 100644
--- a/client.go
+++ b/client.go
@@ -102,7 +102,7 @@ func (c *Client) WithBaseURL(url string) *Client {
 }
 
 // Request :
-func (c *Client) Request(req *http.Request, dst interface{}) error {
+func (c *Client) Request(req *http.Request, dst interface{}) (err error) {
 	c.debugf("request: %v", req)
 	resp, err := c.httpClient.Do(req)
 	c.debugf("response: %v", resp)
@@ -110,7 +110,12 @@ func (c *Client) Request(req *http.Request, dst interface{}) error {
 	if err != nil {
 		return err
 	}
-	defer resp.Body.Close()
+	defer func() {
+		cerr := resp.Body.Close()
+		if err == nil && cerr != nil {
+			err = cerr
+		}
+	}()
 
 	switch {
 	case 200 <= resp.StatusCode && resp.StatusCode <= 299:
@@ -132,12 +137,14 @@ func (c *Client) Request(req *http.Request, dst interface{}) error {
 
 		c.debugf("response body: %v", string(body))
 		return nil
+	case resp.StatusCode == http.StatusBadRequest:
+		return fmt.Errorf("%v: Need to send the request with GET / POST (must be capitalized)", ErrBadRequest)
 	case resp.StatusCode == http.StatusUnauthorized:
-		return fmt.Errorf("%w: invalid key/secret", ErrAccessDenied)
+		return fmt.Errorf("%w: invalid key/secret", ErrInvalidRequest)
 	case resp.StatusCode == http.StatusForbidden:
-		return fmt.Errorf("%w: not permitted", ErrAccessDenied)
+		return fmt.Errorf("%w: not permitted", ErrForbiddenRequest)
 	case resp.StatusCode == http.StatusNotFound:
-		return ErrPathNotFound
+		return fmt.Errorf("%w: wrong path", ErrPathNotFound)
 	default:
 		return fmt.Errorf("unexpected status code %d", resp.StatusCode)
 	}
diff --git a/client_test.go b/client_test.go
index 3d98006..5f52274 100644
--- a/client_test.go
+++ b/client_test.go
@@ -173,7 +173,7 @@ func TestClient(t *testing.T) {
 		var got interface{}
 
 		gotErr := client.Request(req, &got)
-		assert.ErrorIs(t, gotErr, bybit.ErrAccessDenied)
+		assert.ErrorIs(t, gotErr, bybit.ErrForbiddenRequest)
 	})
 	t.Run("404, path not found", func(t *testing.T) {
 		path := "/test"
diff --git a/response.go b/response.go
index 47fc461..9c2aad2 100644
--- a/response.go
+++ b/response.go
@@ -130,8 +130,22 @@ func (r *RateLimitV5Error) Error() string {
 }
 
 var (
-	// ErrPathNotFound : Request path not found
+	// ErrBadRequest :
+	// Need to send the request with GET / POST (must be capitalized)
+	ErrBadRequest = errors.New("bad request")
+	// ErrInvalidRequest :
+	// 1. Need to use the correct key to access;
+	// 2. Need to put authentication params in the request header
+	ErrInvalidRequest = errors.New("authentication failed")
+	// ErrForbiddenRequest :
+	// Possible causes:
+	// 1. IP rate limit breached;
+	// 2. You send GET request with an empty json body;
+	// 3. You are using U.S IP
+	ErrForbiddenRequest = errors.New("access denied")
+	// ErrPathNotFound :
+	// Possible causes:
+	// 1. Wrong path;
+	// 2. Category value does not match account mode
 	ErrPathNotFound = errors.New("path not found")
-	// ErrAccessDenied : Access denied
-	ErrAccessDenied = errors.New("access denied")
 )