update Response API

src/client/connection/response/failure/permanent/error.rs

@@ -0,0 +1,23 @@
+use std::{
+    fmt::{Display, Formatter, Result},
+    str::Utf8Error,
+};
+
+#[derive(Debug)]
+pub enum Error {
+    Code,
+    Utf8Error(Utf8Error),
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        match self {
+            Self::Code => {
+                write!(f, "Status code error")
+            }
+            Self::Utf8Error(e) => {
+                write!(f, "UTF-8 error: {e}")
+            }
+        }
+    }
+}