Several Bug Fixes needed while building my trading bot.

TradierClient/Exceptions/TradierClientException.cs

@@ -21,6 +21,10 @@ public TradierClientException(string message)
         public TradierClientException(HttpResponseMessage response)
         {
             Task<string> resp = response.Content.ReadAsStringAsync();
+            if ( response.StatusCode == System.Net.HttpStatusCode.BadRequest)
+            {
+                throw new TradierClientException($"Server returned 401 Bad Request: {resp.Result}");
+            }
             if (!string.IsNullOrEmpty(resp.Result))
             {
                 if (Equals(response.Content.Headers.ContentType, MediaTypeHeaderValue.Parse("application/json")))

TradierClient/TradierClient.csproj

@@ -16,7 +16,7 @@
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <RepositoryType>Git</RepositoryType>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-    <Version>1.0.11</Version>
+    <Version>1.0.18</Version>
     <AssemblyVersion>1.0.11.0</AssemblyVersion>
     <FileVersion>1.0.11.0</FileVersion>
     <PackageTags>Trading StockMarket Investing Brokerage API .NET C#</PackageTags>

TradierClient/TradierClient/TradierClient.cs

@@ -19,6 +19,25 @@ public class TradierClient
         // TODO: Coming soon
         //public Streaming Streaming { get; set; }
 
+        /// <summary>
+        /// The TradierClient constructor (with an existing HttpClient that's already configured with token and url)
+        /// This allows setting up a proxy server to intercept requests and responses to record them to a file.
+        /// This is useful bother for debugging and for creating unit tests.
+        /// </summary>
+        public TradierClient(HttpClient httpClient, string defaultAccountNumber = null)
+        {
+            Requests request = new Requests(httpClient);
+
+            Authentication = new Authentication(request);
+            Account = new Account(request, defaultAccountNumber);
+            MarketData = new MarketData(request);
+            Trading = new Trading(request, defaultAccountNumber);
+            Watchlist = new WatchlistEndpoint(request);
+
+            // TODO: Coming soon
+            //Streaming = new Streaming(request);
+        }
+
         /// <summary>
         /// The TradierClient constructor (with an existing HttpClient)
         /// </summary>

TradierClient/TradierClient/Trading.cs

@@ -90,6 +90,8 @@ public async Task<IOrder> PlaceMultilegOrder(string accountNumber, string symbol
                 { "price", price.ToString() }
             };
 
+            if (preview) { data.Add("preview", preview.ToString()); }
+
             int index = 0;
 
             foreach (var leg in legs)