Added DummyServerEndpoint for GetPublicKey to verify 'User-Agent' on Requests

DummyServerForHeaderTests/Program.cs

@@ -11,4 +11,14 @@ app.MapGet("/", context => {
     return context.Response.CompleteAsync();
 });
 
+app.MapGet("/v1/destinations/{id}", context => {
+    var userAgents = context.Request.Headers["User-Agent"];
+    Console.WriteLine(userAgents);
+    if (userAgents.ToString().Contains("FITConnectDotNetSDK"))
+        context.Response.StatusCode = 200;
+    else
+        context.Response.StatusCode = 400;
+    return context.Response.CompleteAsync();
+});
+
 app.Run("http://localhost:5050");