Fixed all underlying issues with the "Answer" call.

RelayClient/ServerAPI.cs

@@ -45,9 +45,14 @@ public class ServerAPI
         return offer;
     }
 
-    public static async Task<Uri> PostAnswerAsync(DBOffer answer)
+    public static async Task<Uri?> PostAnswerAsync(DBOffer answer)
     {
         HttpResponseMessage response = await client.PostAsJsonAsync("api/rtc/answer", answer);
+        var body = await response.Content.ReadAsStringAsync();
+
+        Console.WriteLine("PostAnswerAsync status: " + response.StatusCode);
+        Console.WriteLine("PostAnswerAsync body: " + body);
+
         response.EnsureSuccessStatusCode();
         return response.Headers.Location;
     }
@@ -94,6 +99,18 @@ public class ServerAPI
         return response.Headers.Location;
     }
     
+    public static async Task<RtcDescription?> GetAnswerForChannelAsync(string? channelId)
+    {
+        if (string.IsNullOrWhiteSpace(channelId))
+            return null;
+
+        HttpResponseMessage response = await client.GetAsync($"api/rtc/answer/{channelId}");
+        if (!response.IsSuccessStatusCode)
+            return null;
+
+        var json = await response.Content.ReadAsStringAsync();
+        return JsonSerializer.Deserialize<RtcDescription>(json);
+    }
 }
 
 public class RtcDescription