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myHttpClient.DefaultRequestHeaders.Add(
    "Cookie",
    myCookieContainer.GetCookieHeader(myRequestUri));

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// Moving the WebView2 cookies to a cookie container for periodic consumption.
var myCookieContainer = ConvertCookiesToContainer(webView2Cookies);

// Setting the request's URI and creating a GET request message.
var myRequestUri = new Uri("https://my.service.com/path/to/endpoint")
var myMessage = new HttpRequestMessage(HttpMethod.Get, myRequestUri);

// Adding the cookie container's cookie header to the message's header.
myMessage.Headers.Add("Cookie", myCookieContainer.GetCookieHeader(myRequestUri));

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public static CookieContainer ConvertCookiesToContainer(IEnumerable<WebView2Cookie> webView2Cookies)
{
    var cookies = new CookieContainer();
    
    foreach (var cookie in WebView2Cookies)
    {
        cookies.Add(new Cookie
        {
            Domain = cookie.Domain,
            Path = cookie.Path,

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using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Caliburn.Micro;
using Microsoft.Web.WebView2.Core;
using Microsoft.Web.WebView2.Wpf;

namespace MyDesktopApp
{
    public class LoginViewModel : Screen

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<UserControl x:Class="MyDesktopApp.LoginView"
             ...
             xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
             xmlns:cal="http://www.caliburnproject.org">
    <Grid>
        <wv2:WebView2 x:Name="WebView"
                      cal:Message.Attach="[Event NavigationCompleted] = [Action OnNavigationCompletedAsync($source)]"
                      Source="{Binding WebAddress}" />
    </Grid>
</UserControl>