improve err

src/client.rs

@@ -283,7 +283,7 @@ impl Client {
 
         if !key.is_empty() && !token.is_empty() {
             // mainly for the security of token
-            secure_tcp(&mut socket, key).await?;
+            secure_tcp(&mut socket, key).await.map_err(|e| anyhow!("Failed to secure tcp: {}", e))?;
         }
 
         let start = std::time::Instant::now();