provide HTTPHeaderDate when placing Coinbase orders

src/ExchangeSharp/API/Common/APIRequestMaker.cs

@@ -162,7 +162,7 @@ public APIRequestMaker(IAPIRequestHandler api)
 		/// The encoding of payload is API dependant but is typically json.</param>
 		/// <param name="method">Request method or null for default. Example: 'GET' or 'POST'.</param>
 		/// <returns>Raw response</returns>
-		public async Task<string> MakeRequestAsync(string url, string? baseUrl = null, Dictionary<string, object>? payload = null, string? method = null)
+		public async Task<IAPIRequestMaker.RequestResult<string>> MakeRequestAsync(string url, string? baseUrl = null, Dictionary<string, object>? payload = null, string? method = null)
 		{
 			await new SynchronizationContextRemover();
 			await api.RateLimit.WaitToProceedAsync();
@@ -225,7 +225,7 @@ public async Task<string> MakeRequestAsync(string url, string? baseUrl = null, D
 			{
 				response?.Dispose();
 			}
-			return responseString;
+			return new IAPIRequestMaker.RequestResult<string>() { Response = responseString, HTTPHeaderDate = response.Headers.Date };
 		}
 
 		/// <summary>

src/ExchangeSharp/API/Common/BaseAPI.cs

@@ -498,7 +498,7 @@ public void LoadAPIKeysUnsecure(string publicApiKey, string privateApiKey, strin
 		/// The encoding of payload is API dependant but is typically json.
 		/// <param name="method">Request method or null for default</param>
 		/// <returns>Raw response</returns>
-		public Task<string> MakeRequestAsync(string url, string? baseUrl = null, Dictionary<string, object>? payload = null, string? method = null) => requestMaker.MakeRequestAsync(url, baseUrl: baseUrl, payload: payload, method: method);
+		public async Task<IAPIRequestMaker.RequestResult<string>> MakeRequestAsync(string url, string? baseUrl = null, Dictionary<string, object>? payload = null, string? method = null) => await requestMaker.MakeRequestAsync(url, baseUrl: baseUrl, payload: payload, method: method);
 
 		/// <summary>
 		/// Make a JSON request to an API end point
@@ -509,17 +509,28 @@ public void LoadAPIKeysUnsecure(string publicApiKey, string privateApiKey, strin
 		/// <param name="payload">Payload, can be null. For private API end points, the payload must contain a 'nonce' key set to GenerateNonce value.</param>
 		/// <param name="requestMethod">Request method or null for default</param>
 		/// <returns>Result decoded from JSON response</returns>
-		public async Task<T> MakeJsonRequestAsync<T>(string url, string? baseUrl = null, Dictionary<string, object>? payload = null, string? requestMethod = null)
+		public async Task<T> MakeJsonRequestAsync<T>(string url, string? baseUrl = null, Dictionary<string, object>? payload = null, string? requestMethod = null) => (await MakeJsonRequestFullAsync<T>(url, baseUrl: baseUrl, payload: payload, requestMethod: requestMethod)).Response;
+
+		/// <summary>
+		/// Make a JSON request to an API end point, with full retun result
+		/// </summary>
+		/// <typeparam name="T">Type of object to parse JSON as</typeparam>
+		/// <param name="url">Path and query</param>
+		/// <param name="baseUrl">Override the base url, null for the default BaseUrl</param>
+		/// <param name="payload">Payload, can be null. For private API end points, the payload must contain a 'nonce' key set to GenerateNonce value.</param>
+		/// <param name="requestMethod">Request method or null for default</param>
+		/// <returns>full return result, including result decoded from JSON response</returns>
+		public async Task<IAPIRequestMaker.RequestResult<T>> MakeJsonRequestFullAsync<T>(string url, string? baseUrl = null, Dictionary<string, object>? payload = null, string? requestMethod = null)
 		{
 			await new SynchronizationContextRemover();
 
-			string stringResult = await MakeRequestAsync(url, baseUrl: baseUrl, payload: payload, method: requestMethod);
+			string stringResult = (await MakeRequestAsync(url, baseUrl: baseUrl, payload: payload, method: requestMethod)).Response;
 			T jsonResult = JsonConvert.DeserializeObject<T>(stringResult, SerializerSettings);
 			if (jsonResult is JToken token)
 			{
-				return (T)(object)CheckJsonResponse(token);
+				return new IAPIRequestMaker.RequestResult<T>() { Response = (T)(object)CheckJsonResponse(token) };
 			}
-			return jsonResult;
+			return new IAPIRequestMaker.RequestResult<T>() { Response = jsonResult };
 		}
 
 		/// <summary>

src/ExchangeSharp/API/Common/IAPIRequestMaker.cs

@@ -43,17 +43,26 @@ public enum RequestMakerState
     /// </summary>
     public interface IAPIRequestMaker
     {
-        /// <summary>
-        /// Make a request to a path on the API
-        /// </summary>
-        /// <param name="url">Path and query</param>
-        /// <param name="baseUrl">Override the base url, null for the default BaseUrl</param>
-        /// <param name="payload">Payload, can be null. For private API end points, the payload must contain a 'nonce' key set to GenerateNonce value.</param>
-        /// The encoding of payload is API dependant but is typically json.</param>
-        /// <param name="method">Request method or null for default</param>
-        /// <returns>Raw response</returns>
-        /// <exception cref="System.Exception">Request fails</exception>
-        Task<string> MakeRequestAsync(string url, string? baseUrl = null, Dictionary<string, object>? payload = null, string? method = null);
+		public class RequestResult<T>
+		{
+			/// <summary> request response </summary>
+			public T Response { get; set; }
+
+			/// <summary> raw HTTP header date </summary>
+			public DateTimeOffset? HTTPHeaderDate { get; set; }
+		}
+
+		/// <summary>
+		/// Make a request to a path on the API
+		/// </summary>
+		/// <param name="url">Path and query</param>
+		/// <param name="baseUrl">Override the base url, null for the default BaseUrl</param>
+		/// <param name="payload">Payload, can be null. For private API end points, the payload must contain a 'nonce' key set to GenerateNonce value.</param>
+		/// The encoding of payload is API dependant but is typically json.</param>
+		/// <param name="method">Request method or null for default</param>
+		/// <returns>Raw response</returns>
+		/// <exception cref="System.Exception">Request fails</exception>
+		Task<RequestResult<string>> MakeRequestAsync(string url, string? baseUrl = null, Dictionary<string, object>? payload = null, string? method = null);
 
         /// <summary>
         /// An action to execute when a request has been made (this request and state and object (response or exception))

src/ExchangeSharp/API/Exchanges/BL3P/ExchangeBL3PAPI.cs

@@ -264,13 +264,10 @@ protected override async Task<ExchangeOrderResult> OnPlaceOrderAsync(ExchangeOrd
 					throw new NotSupportedException($"{order.OrderType} is not supported");
 			}
 
-			var resultBody = await MakeRequestAsync(
+			var result = (await MakeJsonRequestAsync<BL3POrderAddResponse>(
 					$"/{order.MarketSymbol}/money/order/add",
 					payload: data
-				);
-
-			var result = JsonConvert.DeserializeObject<BL3POrderAddResponse>(resultBody)
-				.Except();
+				)).Except();
 
 			var orderDetails = await GetOrderDetailsAsync(result.OrderId, marketSymbol: order.MarketSymbol);
 
@@ -282,9 +279,7 @@ protected override async Task<ExchangeOrderBook> OnGetOrderBookAsync(string mark
 			if (string.IsNullOrWhiteSpace(marketSymbol))
 				throw new ArgumentException("Value cannot be null or whitespace.", nameof(marketSymbol));
 
-			var resultBody = await MakeRequestAsync($"/{marketSymbol}/money/depth/full");
-
-			var bl3pOrderBook = JsonConvert.DeserializeObject<BL3PReponseFullOrderBook>(resultBody)
+			var bl3pOrderBook = (await MakeJsonRequestAsync<BL3PReponseFullOrderBook>($"/{marketSymbol}/money/depth/full"))
 				.Except();
 
 			bl3pOrderBook.MarketSymbol??= marketSymbol;
@@ -298,16 +293,13 @@ protected override async Task OnCancelOrderAsync(string orderId, string marketSy
 				throw new ArgumentException("Value cannot be null or whitespace.", nameof(marketSymbol));
 			if (isClientOrderId) throw new NotSupportedException("Cancelling by client order ID is not supported in ExchangeSharp. Please submit a PR if you are interested in this feature");
 
-			var resultBody = await MakeRequestAsync(
+			(await MakeJsonRequestAsync<BL3PEmptyResponse>(
 					$"/{marketSymbol}/money/order/cancel",
 					payload: new Dictionary<string, object>
 					{
 						{"order_id", orderId}
 					}
-				);
-
-			JsonConvert.DeserializeObject<BL3PEmptyResponse>(resultBody)
-				.Except();
+				)).Except();
 		}
 
 		protected override async Task<ExchangeOrderResult> OnGetOrderDetailsAsync(string orderId, string marketSymbol = null, bool isClientOrderId = false)
@@ -321,14 +313,10 @@ protected override async Task<ExchangeOrderResult> OnGetOrderDetailsAsync(string
 				{"order_id", orderId}
 			};
 
-			var resultBody = await MakeRequestAsync(
+			var result = (await MakeJsonRequestAsync<BL3POrderResultResponse>(
 					$"/{marketSymbol}/money/order/result",
 					payload: data
-				);
-
-
-			var result = JsonConvert.DeserializeObject<BL3POrderResultResponse>(resultBody)
-				.Except();
+				)).Except();
 
 			return new ExchangeOrderResult
 			{

src/ExchangeSharp/API/Exchanges/Bybit/ExchangeBybitAPI.cs

@@ -81,7 +81,7 @@ private async Task<T> DoMakeJsonRequestAsync<T>(string url, string? baseUrl = nu
 		{
 			await new SynchronizationContextRemover();
 
-			string stringResult = await MakeRequestAsync(url, baseUrl, payload, requestMethod);
+			string stringResult = (await MakeRequestAsync(url, baseUrl, payload, requestMethod)).Response;
 			return JsonConvert.DeserializeObject<T>(stringResult);
 		}
 #nullable disable

src/ExchangeSharp/API/Exchanges/Coinbase/ExchangeCoinbaseAPI.cs

@@ -738,8 +738,10 @@ protected override async Task<ExchangeOrderResult> OnPlaceOrderAsync(ExchangeOrd
 			}
 
 			order.ExtraParameters.CopyTo(payload);
-			JToken result = await MakeJsonRequestAsync<JToken>("/orders", null, payload, "POST");
-			return ParseOrder(result);
+			var result = await MakeJsonRequestFullAsync<JToken>("/orders", null, payload, "POST");
+			var resultOrder = ParseOrder(result.Response);
+			resultOrder.HTTPHeaderDate = result.HTTPHeaderDate.Value.UtcDateTime;
+			return resultOrder;
 		}
 
 		protected override async Task<ExchangeOrderResult> OnGetOrderDetailsAsync(string orderId, string marketSymbol = null, bool isClientOrderId = false)

src/ExchangeSharp/API/Exchanges/Gemini/ExchangeGeminiAPI.cs

@@ -102,7 +102,7 @@ protected internal override async Task<IEnumerable<ExchangeMarket>> OnGetMarketS
 
 			try
 			{
-				string html = await RequestMaker.MakeRequestAsync("/rest-api", "https://docs.gemini.com");
+				string html = (await RequestMaker.MakeRequestAsync("/rest-api", "https://docs.gemini.com")).Response;
 				int startPos = html.IndexOf("<h1 id=\"symbols-and-minimums\">Symbols and minimums</h1>");
 				if (startPos < 0)
 				{

src/ExchangeSharp/Model/ExchangeOrderResult.cs

@@ -46,7 +46,10 @@ public sealed class ExchangeOrderResult
 		/// </summary>
         public decimal Amount { get; set; }
 
-        /// <summary>Amount filled in the market currency. May be null if not provided by exchange</summary>
+        /// <summary>
+		/// In the market currency. May be null if not provided by exchange
+		/// If this is a Trade, then this is the amount filled in the trade. If it is an order, this is the cumulative amount filled in the order so far. 
+		/// </summary>
         public decimal? AmountFilled { get; set; }
 
 		/// <summary>
@@ -67,6 +70,9 @@ public sealed class ExchangeOrderResult
         /// <summary>Order datetime in UTC</summary>
         public DateTime OrderDate { get; set; }
 
+		/// <summary> raw HTTP header date </summary>
+		public DateTime? HTTPHeaderDate { get; set; }
+
         /// <summary>datetime in UTC order was completed (could be filled, cancelled, expired, rejected, etc...). Null if still open.</summary>
         public DateTime? CompletedDate { get; set; }
 

tests/ExchangeSharpTests/ExchangeBinanceAPITests.cs

@@ -102,7 +102,7 @@ public async Task CurrenciesParsedCorrectly()
             var requestMaker = Substitute.For<IAPIRequestMaker>();
 			var binance = await ExchangeAPI.GetExchangeAPIAsync<ExchangeBinanceAPI>();
 			binance.RequestMaker = requestMaker;
-            requestMaker.MakeRequestAsync("/capital/config/getall", ((ExchangeBinanceAPI)binance).BaseUrlSApi).Returns(Resources.BinanceGetAllAssets);
+            requestMaker.MakeRequestAsync("/capital/config/getall", ((ExchangeBinanceAPI)binance).BaseUrlSApi).Returns(new IAPIRequestMaker.RequestResult<string>() { Response = Resources.BinanceGetAllAssets });
             IReadOnlyDictionary<string, ExchangeCurrency> currencies = await binance.GetCurrenciesAsync();
             currencies.Should().HaveCount(3);
             currencies.TryGetValue("bnb", out ExchangeCurrency bnb).Should().BeTrue();

tests/ExchangeSharpTests/MockAPIRequestMaker.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Text;
 using System.Threading.Tasks;
@@ -31,26 +31,26 @@ public class MockAPIRequestMaker : IAPIRequestMaker
         /// <param name="payload"></param>
         /// <param name="method"></param>
         /// <returns></returns>
-        public async Task<string> MakeRequestAsync(string url, string baseUrl = null, Dictionary<string, object> payload = null, string method = null)
+        public async Task<IAPIRequestMaker.RequestResult<string>> MakeRequestAsync(string url, string baseUrl = null, Dictionary<string, object> payload = null, string method = null)
         {
             await new SynchronizationContextRemover();
             RequestStateChanged?.Invoke(this, RequestMakerState.Begin, null);
             if (GlobalResponse != null)
             {
                 RequestStateChanged?.Invoke(this, RequestMakerState.Finished, GlobalResponse);
-                return GlobalResponse;
+                return new IAPIRequestMaker.RequestResult<string>() { Response = GlobalResponse };
             }
             else if (UrlAndResponse.TryGetValue(url, out object response))
             {
                 if (!(response is Exception ex))
                 {
                     RequestStateChanged?.Invoke(this, RequestMakerState.Finished, response as string);
-                    return response as string;
+                    return new IAPIRequestMaker.RequestResult<string>() { Response = response as string };
                 }
                 RequestStateChanged?.Invoke(this, RequestMakerState.Error, ex);
                 throw ex;
             }
-            return @"{ ""error"": ""No result from server"" }";
+            return new IAPIRequestMaker.RequestResult<string>() { Response = @"{ ""error"": ""No result from server"" }" };
         }
     }
 }