How to disable caching of single page application HTML file served through IIS?

  <meta http-equiv="cache-control" content="no-cache, must-revalidate, post-check=0, pre-check=0">

Adding the following into web.config solution worked across Chrome, IE, Firefox, and Safari:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

  <location path="index.html">
    <system.webServer>
      <httpProtocol>
        <customHeaders>
          <add name="Cache-Control" value="no-cache" />
        </customHeaders>
      </httpProtocol>
    </system.webServer>
  </location>

</configuration>

This will ensure that the that Cache-Control header is set to no-cache when requesting index.html.

For .NET Core, I used the following.

        app.UseStaticFiles(new StaticFileOptions
        {
            OnPrepareResponse = context =>
            {                   
                if (context.File.Name == "index.html" ) {
                    context.Context.Response.Headers.Add("Cache-Control", "no-cache, no-store");
                    context.Context.Response.Headers.Add("Expires", "-1");
                }
            }
        });

Credit to How to disable browser cache in ASP.NET core rc2?

When serving your html files, you can append a random query string. This will prevent the browser from using the old versions even if the file is in the browser cache.

/index.html?rnd=timestamp

The other option is to add the no-cache setting at IIS level. This adds Cache-Control: no-cache in the response which tells browsers to not cache the file. It works from IIS 7 onwards.

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <!-- Note the use of the 'location' tag to specify which 
       folder this applies to-->
  <location path="index.html">
    <system.webServer>
      <staticContent>
        <clientCache cacheControlMode="DisableCache" />
      </staticContent>
    </system.webServer>
  </location>
</configuration>