Timeouts with long running ASP.NET MVC Core Controller HTTPPost Method

Setting the RequestTimeout="00:20:00" on the aspNetCore tag and deploying the site will cause it not to timeout.

Issue now only occurs when running from Visual Studio debug mode but not in release mode.

Take note: In ASP.NET RTM the httpPlatform tag has been replaced with aspNetCore in the web.config

Example for ASP.NET Core

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <handlers>
      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified"/>
    </handlers>
    <aspNetCore requestTimeout="00:20:00"  processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" forwardWindowsAuthToken="false"/>
  </system.webServer>
</configuration>

In my case we still had the 502 timeout error at 2 minutes even after updating the requestTimeout parameter. It turned out that kestrel has a 2 minute keep alive timeout which needed to be overridden:

var host = new WebHostBuilder()
               .UseKestrel(o =>
                    {
                        o.Limits.KeepAliveTimeout = TimeSpan.FromMinutes(30);
                    }
                )

But in .Net Core 2.0 there is no web.config file in project. It generate automatically.

I solved the problem by adding .UseKestrel(...) to the BuildWebHost function in Program.cs file as follows:

public static IWebHost BuildWebHost(string[] args) =>
    WebHost.CreateDefaultBuilder(args)
        .UseStartup<Startup>()
        .UseKestrel(o => { o.Limits.KeepAliveTimeout = TimeSpan.FromMinutes(10); })
        .Build();
}

... Update for .net Core 6 ...

in Program.cs file after

var builder = WebApplication.CreateBuilder(args);

add ConfigureKestrel for WebHost like this

builder.WebHost.ConfigureKestrel(c =>
{
   c.Limits.KeepAliveTimeout = TimeSpan.FromMinutes(15);
});