dotnet6 on Azure WebApp - http error 413 request entity too large

Question

I'm getting the following error while uploading large (38 MB) file using file upload on .NET 6 application deployed on Azure using Chrome browser:

I googled and found 2 solutions. It works fine in my local environment but not working after I deployed it to Azure.

Solution 1: In Program.cs file

builder.Services.Configure<KestrelServerOptions>(options =>
{
    options.Limits.MaxRequestBodySize = long.MaxValue;
});
builder.Services.Configure<IISServerOptions>(options =>
{
    options.MaxRequestBodySize = long.MaxValue;
});

Solution 2: ConfigureServices method in Startup.cs file

services.Configure<FormOptions>(options =>
            {
                options.MultipartBodyLengthLimit = long.MaxValue;
            });

Answer 1

To work with large files, we need to make sure the maxAllowedContentLength and maxRequestLength is set correctly according to the request and file size in Web.config file.

maxRequestLength in <system.web>:

<system.web>
    <httpRuntime maxRequestLength="1073741824"/>
</system.web>

Thanks @Thomas for the comments

maxAllowedContentLength in security section

As mentioned in the MSDoc, Add maxAllowedContentLength in the security tag.

<security>
  <requestFiltering>
    <requestLimits maxAllowedContentLength="2147483648" />
  </requestFiltering>
</security>  

Thanks @[bhawanisingh] for clear steps.

Refer this blog for more details on how to work with large files.

I have .Net6 application and It doesn't have web.config file in the solution

When you deploy .Net Core App to Azure App Service (Windows / Linux),web.config file be generated automatically in the deployed files (with basic settings).

Windows:

Linux:

You can even add the web.config file locally in the application root directory and deploy along with other files.