如何在HttpClient的HttpRequestMessage上设置Cookie

您可以按照以下方法为请求设置自定义cookie值：

var baseAddress = new Uri("http://example.com");var cookieContainer = new cookieContainer();using (var handler = new HttpClientHandler() { cookieContainer = cookieContainer })using (var client = new HttpClient(handler) { baseAddress = baseAddress }){    var content = new FormUrlEnpredContent(new[]    {        new KeyValuePair<string, string>("foo", "bar"),        new KeyValuePair<string, string>("baz", "bazinga"),    });    cookieContainer.Add(baseAddress, new cookie("cookieName", "cookie_value"));    var result = await client.PostAsync("/test", content);    result.EnsureSuccessStatusCode();}