Oops I forgot to commit a file

Robust.Shared/Utility/HttpClientUserAgent.cs

@@ -0,0 +1,22 @@
+using System.Net.Http;
+using System.Net.Http.Headers;
+
+namespace Robust.Shared.Utility;
+
+internal static class HttpClientUserAgent
+{
+    private const string ProductName = "RobustToolbox";
+
+    /// <summary>
+    /// Add a Robust-specific user agent to the default request headers of the given <see cref="HttpClient"/>.
+    /// </summary>
+    public static void AddUserAgent(HttpClient client)
+    {
+        var assemblyName = typeof(HttpClientUserAgent).Assembly.GetName();
+        if (assemblyName.Version is { } version)
+        {
+            client.DefaultRequestHeaders.UserAgent.Add(
+                new ProductInfoHeaderValue(ProductName, version.ToString()));
+        }
+    }
+}