Upload Files Sample App

This sample app demonstrates problem with uploading big files in ASP.NET Core when hosting application in IIS web server

How to use the sample

In the appsettings.json file:

1. Set the path for stored files (StoredFilesPath).

   • The sample app sets the value to d:\\temp\\CoreUpload, which assumes that a folder named CoreUpload exists in the folder temp D drive
   • The path must exist. Create a d:\temp\CoreUpload folder on the D: drive or set the path to a suitable location.
   • The app's process requires read/write permissions to the path.
   • IMPORTANT! Disable execute permissions for all users at the path.

2. Set the file size limit (FileSizeLimit) in bytes. The sample app's default value of 12884901888 (12,884,901,888 bytes) permits file uploads up to 12 GB.

3. Publish it to IIS

4. Modify web.config to have hostingModel="outofprocess" and add requestLimits maxAllowedContentLength="4294967295" to requestFiltering section

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <location path="." inheritInChildApplications="false">
    <system.webServer>
      <handlers>
	    <remove name="aspNetCore" />
        <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
      </handlers>
      <aspNetCore processPath="dotnet" arguments=".\SampleApp.dll" stdoutLogEnabled="true" stdoutLogFile=".\logs\stdout" hostingModel="outofprocess" requestTimeout="00:02:00" />
	  <security> 
		<requestFiltering>
		 <requestLimits maxAllowedContentLength="4294967295" />
		</requestFiltering>
		</security>
    </system.webServer>
  </location>
</configuration>

5. Navigate to http://localhost/StreamedSingleFileUploadPhysical choose file greater then 2GB and click Upload button