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diff --git a/VNLib.Data.Caching/Exceptions/InvalidStatusException.cs b/VNLib.Data.Caching/Exceptions/InvalidStatusException.cs
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+/*
+* Copyright (c) 2022 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Data.Caching
+* File: InvalidStatusException.cs 
+*
+* InvalidStatusException.cs is part of VNLib.Data.Caching which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Data.Caching is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU Affero General Public License as 
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* VNLib.Data.Caching is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see https://www.gnu.org/licenses/.
+*/
+
+using System;
+
+using VNLib.Net.Messaging.FBM;
+
+namespace VNLib.Data.Caching.Exceptions
+{
+    /// <summary>
+    /// Raised when the response status code of an FBM Request message is not valid for 
+    /// the specified request
+    /// </summary>
+    public class InvalidStatusException : InvalidResponseException
+    {
+        private readonly string? StatusCode;
+        /// <summary>
+        /// Initalizes a new <see cref="InvalidStatusException"/> with the specfied status code
+        /// </summary>
+        /// <param name="message"></param>
+        /// <param name="statusCode"></param>
+        public InvalidStatusException(string message, string statusCode):this(message)
+        {
+            this.StatusCode = statusCode;
+        }
+
+        ///<inheritdoc/>
+        public InvalidStatusException()
+        {
+        }
+        ///<inheritdoc/>
+        public InvalidStatusException(string message) : base(message)
+        {
+        }
+        ///<inheritdoc/>
+        public InvalidStatusException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+        ///<inheritdoc/>
+        public override string Message => $"InvalidStatusException: Status Code {StatusCode} \r\n {base.Message}";
+    }
+}