retry improvements (#165)

Packages/Nakama/CHANGELOG.md

@@ -3,6 +3,14 @@ All notable changes to this project are documented below.
 
 The format is based on [keep a changelog](http://keepachangelog.com/) and this project uses [semantic versioning](http://semver.org/).
 
+### [Unreleased]
+
+## [3.10.0] - 2023-11-21
+
+### Changed
+- Updated to use the Nakama and Satori .NET 3.9.0 release.
+- Restricted retry attempts to more specific 500-level error codes from the server.
+
 ## [3.9.0] - 2023-08-11
 ### Changed
 - Updated to use the Nakama and Satori .NET 3.9.0 release.

Packages/Nakama/Runtime/UnityWebRequestAdapter.cs

@@ -178,7 +178,19 @@ private static bool IsNetworkError(UnityWebRequest www)
 
         private static bool IsTransientException(Exception e)
         {
-            return e is ApiResponseException apiException && (apiException.StatusCode >= 500 || apiException.StatusCode == -1);
+            if (e is ApiResponseException apiException)
+            {
+                switch (apiException.StatusCode)
+                {
+                    case 500: // Internal Server Error often (but not always) indicates a transient issue in Nakama, e.g., DB connectivity.
+                    case 502: // LB returns this to client if server sends corrupt/invalid data to LB, which may be a transient issue.
+                    case 503: // LB returns this to client if LB determines or is told that server is unable to handle forwarded from LB, which may be a transient issue.
+                    case 504: // LB returns this to client if LB cannot communicate with server, which may be a temporary issue.
+                        return true;
+                }
+            }
+
+            return false;
         }
     }
 }

Packages/Nakama/package.json

@@ -1,6 +1,6 @@
 {
     "name": "com.heroiclabs.nakama-unity",
-    "version": "3.9.0",
+    "version": "3.10.0",
     "unity": "2018.4",
     "displayName": "Nakama Unity",
     "description": "Unity3D client for Nakama server written in C#.",