I have an Owin Test Server:
using (var testServer = TestServer.Create<TestPipelineConfiguration>())
using (var client = new HttpClient(testServer.Handler))
{
    client
        .DefaultRequestHeaders
        .Add("Cookie", $"{AspNetCookies}=HeyThere;");
    client.BaseAddress = new Uri("https://testserver/");
    var message = client
                    .PostAsync("print", new StringContent(
                                                jsonProvider.SerialiseObject(new
                                                {
                                                    Url = "https://some/url"
                                                }),
                                                Encoding.UTF8, "application/json"))
                    .Result;
    //var message = client.GetAsync("test").Result;
    message
        .StatusCode
        .ShouldBeEquivalentTo(HttpStatusCode.OK);
}
I want to set other properties on that cookie, like HttpOnly, Secure and Domain.
Is this possible?
Cookie is a header with list of key-value items. In your code it will look like this:
.Add("Cookie", "cookie1=value1;cookie2=value2")
Properties are part of the cookie value, semicolon separated, e.g. "Cookie=cookievalue; path=/; HttpOnly"
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