How to increase the request size limit using minimal api with .NET 6?

We can configure kestrel through the builder value and specify the max request body size

var builder = WebApplication.CreateBuilder(args);

builder.WebHost.UseKestrel(o => o.Limits.MaxRequestBodySize = null);

null means that there is no limit.

This can be configured in the web.config file.

<system.webServer>
    <security>
        <requestFiltering>
            <requestLimits maxAllowedContentLength="1073741824" />
        </requestFiltering>
    </security>
</system.webServer>

This will set the limit to 1GB

You can use IHttpMaxRequestBodySizeFeature

async (HttpRequest request) =>
{
    var bodySizeFeature = 
    request.HttpContext.Features.Get<IHttpMaxRequestBodySizeFeature>();
    if (bodySizeFeature is not null)
    {
        bodySizeFeature.MaxRequestBodySize = 10; // set limit or null for unlimited
    }
        
    // process request
}