C# HttpClient設置cookies的兩種辦法 (轉發)

一般有兩種辦法

第一種handler.UseCookies=true(默認為true)，默認的會自己帶上cookies，例如

var handler = new HttpClientHandler() { UseCookies = true };
var client = new HttpClient(handler);// { BaseAddress = baseAddress };
client.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0");
client.DefaultRequestHeaders.Add("Connection", "Keep-Alive");
client.DefaultRequestHeaders.Add("Keep-Alive", "timeout=600");
var content = new FormUrlEncodedContent(new[]
            {
                new KeyValuePair<string, string>("email", "xxxx"),
                new KeyValuePair<string, string>("password", "xxxx"),
            });
var result = await client.PostAsync("https://www.xxxx.com/cp/login", content);
result.EnsureSuccessStatusCode();

這種情況post請求登陸成功后，重定向到別的頁面，也會自動帶上cookies。如果把handler.UseCookies設置為false，登陸后重定向的話不會自動帶上cookies，則又會跳轉到登陸頁面。

 

 

第二種設置 handler.UseCookies = false時，則需要手動給headers上加入cookies.

var handler = new HttpClientHandler() { UseCookies = false};
var client = new HttpClient(handler);// { BaseAddress = baseAddress };
var message = new HttpRequestMessage(HttpMethod.Get, url);
message.Headers.Add("Cookie", "session_id=7258abbd1544b6c530a9f406d3e600239bd788fb");
var result = await client.SendAsync(message);
result.EnsureSuccessStatusCode();

如果使用場景是：抓取需要登陸后才能看到的網頁數據，建議使用第一種，不需要設置任何cookies，httpclient會自動把登陸后的cookies放置到后面的請求中。

 

原貼 : http://www.cnblogs.com/xiaozhu39505/p/8033108.html