Set `ContentLength` of `HttpContext.Response`

framework/src/Volo.Abp.AspNetCore.Mvc/Volo/Abp/AspNetCore/Mvc/ContentFormatters/RemoteStreamContentOutputFormatter.cs

@@ -18,13 +18,14 @@ public class RemoteStreamContentOutputFormatter : OutputFormatter
         return typeof(IRemoteStreamContent).IsAssignableFrom(type);
     }
 
-    public override async Task WriteResponseBodyAsync(OutputFormatterWriteContext context)
+    public async override Task WriteResponseBodyAsync(OutputFormatterWriteContext context)
     {
         var remoteStream = (IRemoteStreamContent)context.Object;
 
         if (remoteStream != null)
         {
             context.HttpContext.Response.ContentType = remoteStream.ContentType;
+            context.HttpContext.Response.ContentLength = remoteStream.ContentLength;
 
             if (!remoteStream.FileName.IsNullOrWhiteSpace())
             {

framework/test/Volo.Abp.AspNetCore.Mvc.Tests/Volo/Abp/AspNetCore/Mvc/ContentFormatters/RemoteStreamContentTestController_Tests.cs

@@ -16,6 +16,7 @@ public class RemoteStreamContentTestController_Tests : AspNetCoreMvcTestBase
         var result = await GetResponseAsync("/api/remote-stream-content-test/download");
         result.Content.Headers.ContentType?.ToString().ShouldBe("application/rtf");
         result.Content.Headers.ContentDisposition?.FileName.ShouldBe("download.rtf");
+        result.Content.Headers.ContentLength.ShouldBe("DownloadAsync".Length);
         (await result.Content.ReadAsStringAsync()).ShouldBe("DownloadAsync");
     }