C#发起HTTP请求Post请求

https://www.cnblogs.com/jiangchengbiao/p/9982788.html

浏览器能看到的数据  用后端模拟请求都能获取到  如果拿不到 看看是不是请求参数哪里没设置 刚好服务器检查了这个参数

            string url = "";
            string para = "";
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);//创建请求对象
            request.Method = "Post";//请求方式
            request.KeepAlive = true;
            request.ContentType = "application/json";//请求头参数
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(para);//设置请求参数
            request.ContentLength = bytes.Length;
            Stream stream = request.GetRequestStream();
            stream.Write(bytes, 0, bytes.Length);//写入参数
            stream.Close();
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())//响应对象
            {
                StreamReader reader = new StreamReader(response.GetResponseStream());
                string str = reader.ReadToEnd();//获取返回的页面信息
                //根据返回的格式 创建一个对象  把Json反序列化成对应的类型对象
                //反序列化的时候需要先创建一个模型来存放数据
                Dto dto = JsonConvert.DeserializeObject<Dto>(str);
            }

设置请求头参数

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request.Headers.Add("Accept", "*/*");  request.Headers.Add("Accept-Encoding", "gzip, deflate, sdch");  request.Headers.Add("Accept-Language", "zh-CN,zh;q=0.9");  request.KeepAlive = true; // request.Connection = "keep-alive"; // request.Headers.Add("Cookie", "");  request.Host = "sshhbhaokn.jin10.com:8083";    request.Headers.Add("Referer", "https://hero.jin10.com/");    request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36";

　　

在f12的元素上 右键 copy Xpath 可以拷贝出当前元素的位置  

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获取token请求  

 1. 用上面那种把参数先转成字节才写入会报错 

 2.设置请求头长度也会报错