perf(client): optimize header creation

Author: stainless-app[bot]

src/Orb/Core/ParamsBase.cs

@@ -12,6 +12,22 @@ namespace Orb.Core;
 
 public abstract record class ParamsBase
 {
+    static readonly IReadOnlyDictionary<string, string> s_defaultHeaders;
+
+    static ParamsBase()
+    {
+        var runtime = GetRuntime();
+        s_defaultHeaders = new Dictionary<string, string>
+        {
+            ["X-Stainless-Arch"] = GetOSArch(),
+            ["X-Stainless-Lang"] = "csharp",
+            ["X-Stainless-OS"] = GetOS(),
+            ["X-Stainless-Package-Version"] = GetPackageVersion(),
+            ["X-Stainless-Runtime"] = runtime.Name,
+            ["X-Stainless-Runtime-Version"] = runtime.Version,
+        };
+    }
+
     private protected FreezableDictionary<string, JsonElement> _queryProperties = [];
 
     public IReadOnlyDictionary<string, JsonElement> QueryProperties
@@ -163,13 +179,10 @@ protected string QueryString(ClientOptions options)
 
     protected static void AddDefaultHeaders(HttpRequestMessage request, ClientOptions options)
     {
-        request.Headers.Add("X-Stainless-Arch", GetOSArch());
-        request.Headers.Add("X-Stainless-Lang", "csharp");
-        request.Headers.Add("X-Stainless-OS", GetOS());
-        request.Headers.Add("X-Stainless-Package-Version", GetPackageVersion());
-        var (runtimeName, runtimeVersion) = GetRuntime();
-        request.Headers.Add("X-Stainless-Runtime", runtimeName);
-        request.Headers.Add("X-Stainless-Runtime-Version", runtimeVersion);
+        foreach (var header in s_defaultHeaders)
+        {
+            request.Headers.Add(header.Key, header.Value);
+        }
 
         if (options.APIKey != null)
         {