Added a request configurator

Author: alexeyzimarev

RestSharp/Http.Sync.cs

@@ -202,7 +202,7 @@ protected virtual HttpWebRequest ConfigureWebRequest(string method, Uri url)
             webRequest.Pipelined = Pipelined;
             webRequest.UnsafeAuthenticatedConnectionSharing = UnsafeAuthenticatedConnectionSharing;
             webRequest.ServicePoint.Expect100Continue = false;
-
+            
             AppendHeaders(webRequest);
             AppendCookies(webRequest);
 
@@ -251,6 +251,8 @@ protected virtual HttpWebRequest ConfigureWebRequest(string method, Uri url)
 
             webRequest.ConnectionGroupName = ConnectionGroupName;
 
+            WebRequestConfigurator?.Invoke(webRequest);
+
             return webRequest;
         }
     }

RestSharp/Http.cs

@@ -235,11 +235,10 @@ public Http()
         /// <returns></returns>
         public static IHttp Create() => new Http();
 
-        protected virtual HttpWebRequest CreateWebRequest(Uri url)
-        {
-            return (HttpWebRequest) WebRequest.Create(url);
-        }
+        protected virtual HttpWebRequest CreateWebRequest(Uri url) => (HttpWebRequest) WebRequest.Create(url);
 
+        public Action<HttpWebRequest> WebRequestConfigurator { get; set; }
+        
         partial void AddSyncHeaderActions();
 
         private void AddSharedHeaderActions()
@@ -248,9 +247,7 @@ private void AddSharedHeaderActions()
             restrictedHeaderActions.Add("Content-Type", (r, v) => r.ContentType = v);
             restrictedHeaderActions.Add("Date", (r, v) =>
             {
-                DateTime parsed;
-
-                if (DateTime.TryParse(v, out parsed))
+                if (DateTime.TryParse(v, out var parsed))
                     r.Date = parsed;
             });
 

RestSharp/IHttp.cs

@@ -138,5 +138,7 @@ public interface IHttp
         IWebProxy Proxy { get; set; }
 
         RemoteCertificateValidationCallback RemoteCertificateValidationCallback { get; set; }
+        
+        Action<HttpWebRequest> WebRequestConfigurator { get; set; }
     }
 }

RestSharp/RestClient.cs

@@ -95,6 +95,8 @@ public RestClient(string baseUrl) : this()
         private IDictionary<string, IDeserializer> ContentHandlers { get; }
 
         private IList<string> AcceptTypes { get; }
+        
+        private Action<HttpWebRequest> WebRequestConfigurator { get; set; }
 
         /// <summary>
         /// Enable or disable automatic gzip/deflate decompression
@@ -252,6 +254,9 @@ public IRestResponse<T> Deserialize<T>(IRestResponse response)
             return Deserialize<T>(response.Request, response);
         }
 
+        public void ConfigureWebRequest(Action<HttpWebRequest> configurator) =>
+            WebRequestConfigurator = configurator;
+
         /// <summary>
         ///     Assembles URL to call based on parameters, method and resource
         /// </summary>
@@ -419,7 +424,7 @@ private static string EncodeParameter(Parameter parameter, Encoding encoding) =>
         private static readonly ParameterType[] MultiParameterTypes =
             {ParameterType.QueryString, ParameterType.GetOrPost};
 
-        private IHttp ConfigureHttp(IRestRequest request)
+        internal IHttp ConfigureHttp(IRestRequest request)
         {
             var http = Http.Create();
 
@@ -429,6 +434,7 @@ private IHttp ConfigureHttp(IRestRequest request)
             http.ResponseWriter = request.ResponseWriter;
             http.CookieContainer = CookieContainer;
             http.AutomaticDecompression = AutomaticDecompression;
+            http.WebRequestConfigurator = WebRequestConfigurator;
 
             // move RestClient.DefaultParameters into Request.Parameters
             foreach (var p in DefaultParameters)