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Hello
I am developing an ASP.Net core app which is running in Azure App service (on Linux in Docker container).
As a large file needs to be uploaded, I followed the instruction in the following website.
https://learn.microsoft.com/en-us/aspnet/core/mvc/models/file-uploads?view=aspnetcore-3.1#upload-large-files-with-streaming
The attribute [DisableFormValueModelBinding] was added to begin to process the file as soon as it begins to be transferred.
It works as expected on my development machine (Mac, Windows, Linux, and Docker in Linux) - the controller action is triggered as soon as a file begins to be transferred.
But in Azure App service, the controller action is triggered only after the whole file is transferred.
I tested so many times with small files and large files, but this is consistent.
In Azure App service, the controller action is triggered only after the whole file is transferred, while it is triggered before file transfer is completed on my development PCs.
I am stuck with this issue. No information cannot be found regarding this issue.
Can somebody help me, please?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(51.2, 79%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKG%3C/text%3E%3C/svg%3E)
Hello anonymous user-2107 , Could you please share which code sample you are using? I tried the sample https://github.com/dotnet/AspNetCore.Docs/tree/master/aspnetcore/mvc/models/file-uploads/samples/3.x/SampleApp (provided in the same guide what you followed) and deployed to App Service on Linux container. File Upload using Streaming hits the controller immediately. Other sample using Buffering would read the entire file into IFormFile first as expected.
Also, when you said it works in local development machine with same code, are you sure that it's not misleading due to very fast file transfer speed in local machine giving the impression of action getting triggered immediately?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(124.80000000000001, 49%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBH%3C/text%3E%3C/svg%3E)
I had the exact same issue and I fixed it updating the HTTP version to 2.0 instead of 1.1
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I got the same issue, and it only appears in the Linux environment on Azure App Service. Do you know how to resolve this?