Httpclient问题

Question

问题:我正在尝试使用httpclient从site.Now中获取数据，该站点要求您首先访问一个链接，然后只有您可以将数据发布到下一个链接。Link1是一个简单的get请求，Link2是一个post请求，现在我认为该站点首先从link1中存储一些cookie，然后才允许您将数据发布到link2，因为每当我试图以匿名的方式打开link2时，该站点就会显示错误消息“会话超时或达到最大连接限制。不能再继续了。请关闭并重新启动浏览器”，现在我已经尝试了：

 try
        {
            //Send the GET request
            httpResponse = await httpClient.GetAsync(new Uri(link1UriString));
            //Send the POSTrequest
             httpResponse = await httpClient.PostAsync(new Uri(link2uriString),postContent);                
            httpResponseBody = await httpResponse.Content.ReadAsStringAsync();

            }

但是我得到了会话超时错误消息。如何维护httpClient中持续从python中的web.Like接收到的会话的cookie

 opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookielib.CookieJar()))
 urllib2.install_opener(opener)

Link1

Link2

Answer 1

您可以使用CookieContainer为您处理cookies。

这样做，您就可以像这样创建HttpClient。

using System.Net;
using System.Net.Http;

CookieContainer cookies = new CookieContainer();
HttpClientHandler handler = new HttpClientHandler();
handler.CookieContainer = cookies;
HttpClient httpClient = new HttpClient(handler);

httpResponse = await httpClient.GetAsync(new Uri(link1UriString));

(注意，它使用了HttpClient在System.Net.Http中的版本)

Answer 2

因此，在第一个响应之后，就有了Set-Cookie头：

var responseMessage = await httpClient.GetAsync("http://115.248.50.60/registration/Main.jsp?wispId=1&nasId=00:15:17:c8:09:b1");
IEnumerable<string> values;
var coockieHeader = string.Empty;
if (responseMessage.Headers.TryGetValues("set-cookie", out values))
{
    coockieHeader = string.Join(string.Empty, values);
}

在此之后，只需将cookie设置为请求消息：

        var httpRequestMessage = new HttpRequestMessage
        {
            RequestUri = new Uri("http://115.248.50.60/registration/chooseAuth.do"),
            Content = postContent,
            Method = HttpMethod.Post
        };

        httpRequestMessage.Headers.Add("Cookie", values);
        var httpResponse = await httpClient.SendAsync(httpRequestMessage);