feat: modify request

ShipEngineSDK/ShipEngine.cs

@@ -225,6 +225,17 @@ public ShipEngine(HttpClient httpClient) : base()
             _client = httpClient;
         }
 
+        /// <summary>
+        /// Modifies the request before it is sent to the ShipEngine API
+        /// </summary>
+        /// <param name="modifyRequest"></param>
+        /// <returns></returns>
+        public ShipEngine ModifyRequest(Action<HttpRequestMessage> modifyRequest)
+        {
+            base.ModifyRequest = modifyRequest;
+            return this;
+        }
+
         /// <summary>
         /// Dispose of the ShipEngine client
         /// </summary>

ShipEngineSDK/ShipEngineClient.cs

@@ -45,6 +45,11 @@ public class ShipEngineClient
         /// </summary>
         public CancellationToken CancellationToken { get; set; }
 
+        /// <summary>
+        /// Modifies the client request before it is sent
+        /// </summary>
+        public Action<HttpRequestMessage>? ModifyRequest { get; set; }
+
         /// <summary>
         /// Sets the HttpClient User agent, the json media type, and the API key to be used
         /// for all ShipEngine API calls unless overrwritten at the method level.
@@ -199,6 +204,7 @@ public virtual async Task<T> SendHttpRequestAsync<T>(HttpMethod method, string p
                 try
                 {
                     var request = BuildRequest(method, path, jsonContent);
+                    ModifyRequest?.Invoke(request);
                     response = await client.SendAsync(request, cancellationToken);
 
                     var deserializedResult = await DeserializedResultOrThrow<T>(response);