fix: Allow Relay hosts/servers on WebGL (#2321)

* fix: Allow Relay hosts/servers on WebGL

* Add PR number to CHANGELOG entry

Author: simon-lemay-unity

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -11,10 +11,13 @@ Additional documentation and release notes are available at [Multiplayer Documen
 ### Added
 
 ### Changed
+
 - The default listen address of `UnityTransport` is now 0.0.0.0. (#2307)
 
 ### Fixed
 
+- Fixed an issue in `UnityTransport` where an exception would be thrown if starting a Relay host/server on WebGL. This exception should only be thrown if using direct connections (where WebGL can't act as a host/server). (#2321)
+
 ## [1.2.0] - 2022-11-21
 
 ### Added

com.unity.netcode.gameobjects/Runtime/Transports/UTP/UnityTransport.cs

@@ -1471,7 +1471,7 @@ public void CreateDriver(UnityTransport transport, out NetworkDriver driver,
                 heartbeatTimeoutMS: transport.m_HeartbeatTimeoutMS);
 
 #if UNITY_WEBGL && !UNITY_EDITOR
-            if (NetworkManager.IsServer)
+            if (NetworkManager.IsServer && m_ProtocolType != ProtocolType.RelayUnityTransport)
             {
                 throw new Exception("WebGL as a server is not supported by Unity Transport, outside the Editor.");
             }