Question

此问题曾被问过几次，但我找不到明确的答案。甚至可以使用System.Net.Http.HttpClient获取响应cookie吗？

Answer 1

下面是我用于访问服务器生成的cookie的一些示例代码。我刚试过它，它对我有用。我改变了凭证。如果你想看到它工作，你需要创建一个nerddinner帐户。

    [Fact]
    public async Task Accessing_resource_secured_by_cookie()
    {
        var handler = new HttpClientHandler();
        var httpClient = new HttpClient(handler);

        Assert.Equal(0, handler.CookieContainer.Count);

        // Create a login form
        var body = new Dictionary<string, string>() 
        {
            {"UserName",  "<username>"},
            {"Password", "<password>"},
            {"RememberMe", "false"}
        };
        var content = new FormUrlEncodedContent(body);

        // POST to login form
        var response = await httpClient.PostAsync("http://www.nerddinner.com/Account/LogOn?returnUrl=%2F", content);

        // Check the cookies created by server
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        Assert.Equal(1, handler.CookieContainer.Count);
        var cookies = handler.CookieContainer.GetCookies(new Uri("http://www.nerddinner.com"));
        Assert.Equal(".ASPXAUTH", cookies[0].Name);

        // Make new request to secured resource
        var myresponse = await httpClient.GetAsync("http://www.nerddinner.com/Dinners/My");

        var stringContent = await myresponse.Content.ReadAsStringAsync();
        Assert.Equal(HttpStatusCode.OK, myresponse.StatusCode);
    }

从代码中可以看出，您无法直接从HTTP响应消息中获取响应cookie。我怀疑HttpClientHandler在返回之前剥离了响应的标头。但是，响应中的cookie放在CookieContainer中，您可以从那里访问它们。

Answer 2

要获取响应cookie，可以使用此方法；

private async Task<string> GetCookieValue(string url, string cookieName)
{
    var cookieContainer = new CookieContainer();
    var uri = new Uri(url);
    using (var httpClientHandler = new HttpClientHandler
    {
        CookieContainer = cookieContainer
    })
    {
        using (var httpClient = new HttpClient(httpClientHandler))
        {
            await httpClient.GetAsync(uri);
            var cookie = cookieContainer.GetCookies(uri).Cast<Cookie>().FirstOrDefault(x => x.Name == cookieName);
            return cookie?.Value;
        }
    }
}

如何使用System.Net.Http.HttpClient获取响应cookie？

2 个答案: