Hi,
The MVC upload progress do not update the progress percentage when RUN IN IIS.
You can see the behavior using your demo
http://mvc.devexpress.com/UploadControl/Callbacks
The problem DO NOT occur with the ASPX demo.
http://demos.devexpress.com/ASPxperienceDemos/UploadControl/Example.aspx
The MVC demo run fine on my local machine using the Visual studio development server. The demo do not run correctly when I configure the application to run in IIS.
It seems that the handler execute but the return status is always EMPTY_STATUS (<status empty='true'></status>)
Thanks
We have closed this ticket because another page addresses its subject:
ASPxUploadControl - Advanced Mode - support web farms, web gardensUploadControl - upload progress does not work in .NET Framework 4, web farm support
Answers
Hello Martin:
Yes, it is a limitation in our control that does not allow it to work in a web farm environment. However, Session is not an appropriate solution in this case since it does not allow parallel requests, so the progress feature will also be broken.
We have found a workaround for this problem with the client affinity feature. It is described in the following discussion:
http://stackoverflow.com/questions/866108/how-to-keep-user-requests-on-the-same-server-when-using-iis-nlb
In case of an enabled client affinity, all TCP connections are directed to the same cluster host, so the SetStatus method should start to work as expected.
Thanks
Kate.
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Hi Martin:
Thank you for the detailed explanation. Although the idea of utilizing an arbitrary data store sounds feasible, it is unlikely that we will support it in the near future. I want to be fair to you with this. We do not refuse your suggestion, but the number of scenarios when it may/should be used is low. Therefore, we decided not to change the current implementation. However, we will possibly re-consider our position if we receive further inquiries regarding this functionality. For now, I recommend that you follow recommendations from my previous posts, as a workaround.
Your understanding is appreciated.
Thanks
Kate.
Hi Martin,
I think you will be interested to know that we are planning to improve the functionality of our UploadControl (both for WebForms and MVC extensions) in the context of a newly created suggestion:
ID: Q367420 (ASPxUploadControl - Advanced Mode - support web farms, web gardens)
Regards,
Serge
Hello Martin:
I am afraid the upload progress does not work in .NET Framework 3.5. This problem is related to the framework limitation, so we cannot avoid it.
I have passed this report to our tech writers. They will discuss the possibility to include information about this limitation in our documents.
I will keep you informed of any progress.
Thanks
Kate.
My site run with .NET 4.
It's hard to believe there is limitations for .NET 4 compare to previous versions.
What limitations are you talking about?
Thanks
Hello Martin:
In this situation we need additional time to research the issue. Please accept our apologies for the delay.
Thanks
Kate.
Hello Martin:
I have tested this demo in .NET Framevork 4, and it seems that the progress panel works as expected. So, I assume that the problem is related to the IIS settings.
By default, the ProgressBar feature requires FullTrust because we use the HttpWorkerRequest object, which is disabled in the Medium Trust environment. So, I suggest that you check the trust level and set it to Full.
If it is impossible, please use the Advanced upload mode. This feature is described in the following document:
ASP.NET Controls Upload Modes
Thanks
Kate.
Site already in Full trust.
That does not make any sense. Really. I have the same issue on both dev (Win7) and production (Win2008R2) environment
The progress bar was working with the previous release, it just stop working with the last update.
Your demo site does not even work, so how can you say it's an IIS settings? The ASP.NET work, so I'm guessing you are using the same "Back-end" source code so BOTH sould work.
I have attached a sample project.
It won't work
I'm already using the Silverlight upload control as an alternative to upload files
Hello Martin:
Please accept my apologies for the delay in responding. This issue is reproduced with your example, and I passed it to our developers for more detailed research. I will keep you informed of any progress.
Thanks
Kate.
Hello Martin:
Please accept my apologies for the huge delay in responding. We have made additional tests and found that basically the control works as expected, however there are additional factors that may affect progressing:
Upload Control HTTP Handler
Attached is a video that illustrates how your sample works on our side. Please try to adjust your project with settings illustrated in this video and try to redeploy it on the server.
If these settings do not help, please reactivate this ticket. If you have a possibility to publish an original problematic project, please provide it. Maybe, there are some additional factors that affect UploadControl.
Thanks
Kate.
Hi,
Modifying the web.config to add the security element corrected my development issue.
In our production environment, the problem remains.
After looking trough your code, I have found that some come make it not possible to work in a webfarm environment.
The following lines are the issue
From the UploadProgressManager class:
public static void SetStatus(string uploadKey, UploadProgressStatus status) {
HttpContext.Current.Application[RenderUtils.ProgressHandlerKeyQueryParamName + uploadKey] = status;
}
public static UploadProgressStatus GetStatus(string uploadKey) {
return HttpContext.Current.Application[RenderUtils.ProgressHandlerKeyQueryParamName + uploadKey] as UploadProgressStatus;
}
Since you are using the "Application" object to cache the progress, there is no way that will work in an non-sticky load balanced environment.
Why not using the "Session" object instead??? Or maybe give an option to use either one.
I could have "override" some methods in you code but since almost all method use in the process are static, I can't.
Any idea?
Thanks