C# Httpclient编程

今天研究了一天C#如何添加cookie到httpcient里面，从而发请求时，能把cookie作为头部发出，最后发现根本加不进去。
Httpclient的cookie是来自上一个请求的响应，httpclient会自动把上一个请求的响应里面的cookie保存起来，所以当发送几个有关联的request，就必须要用同一个Httpclient
示例：
//第一个请求HttpClient client = new HttpClient();// 为JSON格式添加一个Accept报头//client.DefaultRequestHeaders.Accept.Add(//    new MediaTypeWithQualityHeaderValue("application/json"));string strDecodeBody = HttpUtility.UrlEncode(strBody);HttpContent content = new StringContent(strDecodeBody);content.Headers.ContentType = new MediaTypeHeaderValue("application/json");client.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0");client.DefaultRequestHeaders.Add("Authentication", "123");HttpResponseMessage response = null;response = client.PostAsync(strIP, content).Result;if (response != null){if (expectCode == HttpStatusCode.OK){var resultValue = response.Content.ReadAsStringAsync().Result;string strResponse = HttpUtility.UrlDecode(resultValue.ToString());string[] strCookies = (string[])response.Headers.GetValues("Set-Cookie");if(strCookies.Length>0){strCookie = strCookies[0].Substring(0, strCookies[0].IndexOf(';'));}}}//第二个请求，在这个请求里，没有设置cookie，由于跟第一个请求使用相同httpclient，所以cookie会自动放入请求头部发给服务器string strEncodeBody = HttpUtility.UrlEncode(strBody);HttpContent content = new StringContent(strEncodeBody);content.Headers.ContentType = new MediaTypeHeaderValue("application/json");HttpResponseMessage response = null;response = client.PostAsync(strIP, content).Result;if (response != null){if (expectCode == HttpStatusCode.OK){var resultValue = response.Content.ReadAsStringAsync().Result;string strResponse = HttpUtility.UrlDecode(resultValue.ToString());return strResponse;}}顶

转载于:https://www.cnblogs.com/shiningrise/p/5931362.html

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