File result improved.

Dockerfile

@@ -38,7 +38,9 @@ FROM microsoft/dotnet:2.2-runtime-deps-alpine
 WORKDIR /app
 
 # add libuv
-RUN apk add --no-cache libuv \
+RUN apk update \
+ && apk add --no-cache libc6-compat \
+ && apk add --no-cache libuv \
  && ln -s /usr/lib/libuv.so.1 /usr/lib/libuv.so
 
 # Copy from build stage

src/Squidex/Areas/Api/Controllers/Assets/AssetContentController.cs

@@ -70,7 +70,7 @@ namespace Squidex.Areas.Api.Controllers.Assets
 
             Response.Headers[HeaderNames.ETag] = entity.FileVersion.ToString();
 
-            return new FileCallbackResult(entity.MimeType, entity.FileName, async bodyStream =>
+            return new FileCallbackResult(entity.MimeType, entity.FileName, true, async bodyStream =>
             {
                 var assetId = entity.Id.ToString();
 

src/Squidex/Areas/Api/Controllers/Backups/BackupContentController.cs

@@ -45,7 +45,7 @@ namespace Squidex.Areas.Api.Controllers.Backups
         [AllowAnonymous]
         public IActionResult GetBackupContent(string app, Guid id)
         {
-            return new FileCallbackResult("application/zip", "Backup.zip", bodyStream =>
+            return new FileCallbackResult("application/zip", "Backup.zip", false, bodyStream =>
             {
                 return assetStore.DownloadAsync(id.ToString(), 0, null, bodyStream);
             });

src/Squidex/Areas/Api/Controllers/Statistics/UsagesController.cs

@@ -64,7 +64,7 @@ namespace Squidex.Areas.Api.Controllers.Statistics
         {
             var today = DateTime.Today;
 
-            return new FileCallbackResult("text/csv", $"Usage-{today:yyy-MM-dd}.csv", stream =>
+            return new FileCallbackResult("text/csv", $"Usage-{today:yyy-MM-dd}.csv", false, stream =>
             {
                 return appLogStore.ReadLogAsync(App, today.AddDays(-30), today, stream);
             });

src/Squidex/Pipeline/FileCallbackResult.cs

@@ -13,15 +13,19 @@ using Microsoft.Extensions.DependencyInjection;
 
 namespace Squidex.Pipeline
 {
-    public class FileCallbackResult : FileResult
+    public sealed class FileCallbackResult : FileResult
     {
+        public bool Send404 { get; }
+
         public Func<Stream, Task> Callback { get; }
 
-        public FileCallbackResult(string contentType, string name, Func<Stream, Task> callback)
+        public FileCallbackResult(string contentType, string name, bool send404, Func<Stream, Task> callback)
             : base(contentType)
         {
             FileDownloadName = name;
 
+            Send404 = send404;
+
             Callback = callback;
         }
 

src/Squidex/Pipeline/FileCallbackResultExecutor.cs

@@ -30,10 +30,17 @@ namespace Squidex.Pipeline
             }
             catch (Exception e)
             {
-                Logger.LogCritical(new EventId(99), e, "Failed to send result.");
+                if (!context.HttpContext.Response.HasStarted && result.Send404)
-
+                {
                     context.HttpContext.Response.Headers.Clear();
                     context.HttpContext.Response.StatusCode = 404;
+
+                    Logger.LogCritical(new EventId(99), e, "Failed to send result.");
+                }
+                else
+                {
+                    throw;
+                }
             }
         }
     }