Adding a hard coded authentication header to the Coveo HTML Index Crawler

PreAuthenticationCustomHeader.cs

using Sitecore.Configuration;
using Coveo.SearchProvider.Processors.FetchPageContent.PreAuthenticators;

namespace CPA.Foundation.Coveo.Processors.preAuthentication
{
    /// <summary>
    /// Adds a custom authentication header so that Coveo indexer can bypass login page for authenticated content
    /// https://docs.coveo.com/en/2326/coveo-for-sitecore-v5/index-page-content-with-the-fetchpagecontentprocessor#the-preauthentication-section
    /// </summary>
    public class PreAuthenticationCustomHeader : IFetchPageContentPreAuthenticatorProcessor
    {
        public void Process(FetchPageContentPreAuthenticatorArgs args)
        {
            var headerName = Settings.GetSetting(Constants.AuthenticationHeaderName);
            var headerValue = Settings.GetSetting(Constants.AuthenticationHeaderValue);
            args?.Request?.Headers?.Add(headerName, headerValue);
        }
    }
}