Throw S3FileStorageException when something goes wrong and response is not as expected.

src/Foundatio.AWS/Storage/S3FileStorage.cs

@@ -12,6 +12,7 @@
 using Amazon.S3.Model;
 using Amazon.S3.Util;
 using Foundatio.AWS.Extensions;
+using Foundatio.AWS.Storage;
 using Foundatio.Extensions;
 using Foundatio.Serializer;
 using Microsoft.Extensions.Logging;
@@ -137,10 +138,12 @@ public async Task<FileSpec> GetFileInfoAsync(string path)
         try
         {
             var response = await _client.GetObjectMetadataAsync(req).AnyContext();
+            if (response.HttpStatusCode == System.Net.HttpStatusCode.NotFound)
+                return null;
             if (!response.HttpStatusCode.IsSuccessful())
             {
                 _logger.LogDebug("[{HttpStatusCode}] Unable to get file info for {Path}", response.HttpStatusCode, req.Key);
-                return null;
+                throw new Exception($"Invalid status code {res.HttpStatusCode} ({(int)res.HttpStatusCode}): Expected 200 OK or 404 NotFound");
             }
 
             return new FileSpec

src/Foundatio.AWS/Storage/S3FileStorageException.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Foundatio.AWS.Storage {
+    public class S3FileStorageException : Exception {
+        public S3FileStorageException() : base() {
+        }
+
+        public S3FileStorageException(string message) : base(message) {
+        }
+
+        public S3FileStorageException(string message, Exception innerException) : base(message, innerException) {
+        }
+    }
+}