Separate invalid key and unmatched key error

application/controller/socket.go

@@ -41,10 +41,14 @@ import (
 
 // Errors
 var (
-	ErrSocketAuthFailed = NewError(
+	ErrSocketInvalidAuthKey = NewError(
 		http.StatusForbidden,
 		"To use Websocket interface, a valid Auth Key must be provided")
 
+	ErrSocketAuthFailed = NewError(
+		http.StatusForbidden,
+		"Authentication has failed with provided Auth Key")
+
 	ErrSocketUnableToGenerateKey = NewError(
 		http.StatusInternalServerError,
 		"Unable to generate crypto key")

application/controller/socket_verify.go

@@ -98,6 +98,8 @@ func (s socketVerification) setServerConfigRespond(
 func (s socketVerification) Get(
 	w http.ResponseWriter, r *http.Request, l log.Logger) error {
 	hd := w.Header()
+	hd.Add("Cache-Control", "no-store")
+	hd.Add("Pragma", "no-store")
 
 	key := r.Header.Get("X-Key")
 
@@ -110,11 +112,11 @@ func (s socketVerification) Get(
 			return nil
 		}
 
-		return ErrSocketAuthFailed
+		return ErrSocketInvalidAuthKey
 	}
 
 	if len(key) > 64 {
-		return ErrSocketAuthFailed
+		return ErrSocketInvalidAuthKey
 	}
 
 	// Delay the brute force attack. Use it with connection limits (via