HttpWebRequest （http请求） HttpWebResponse(http响应)

HttpWebRequest和HttpWebResponse类是用于发送和接收HTTP数据的最好选择

HttpWebRequest定义：

eg: string url="https://www.baidu.com";

ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertificate);
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

HttpWebRequest httpRequest=（HttpWebRequest）HttpWebRequest.Create(url);

// 参数赋值

X509Certificate2 cerCaiShang = new X509Certificate2(p12certfile, cerpassword);
if (!isHttp)
{
httpRequest.ClientCertificates.Add(cerCaiShang);
}

httpRequest.Method="POST";

httpRequest.ContentType="application/json";

httpRequest.Headers.Add(key,value);

httpRequest.Refer=null;

httpRequest.AllowAutoRedirect=true;

httpRequest.UserAgent="";

httpRequest.Accept="*/*";

//  如果请求方式是Http  还需要加上 httpRequest.ServicePoint.Expect100Continue=false;

//  如果请求方式不是GET，

// Stream requestStem=httpRequest.GetRequestStream();

//StreamWriter sw=new StreamWriter(requestStem);

// sw.Write(body);   // body 为json格式

//sw.Close();

// 响应

HttpWebResponse hhtpResponse=(HttpWebResponse)httpWebRequest.GetResponse();

Stream receiveStream=httpResponse.GetResponseStream();

string result=string.empty();

int statusCode=0;

using(StreamReader sr=new StreamReader(receiveStream)){

result=sr.ReadToEnd();

}

statusCode=(int)httpResponse.StatusCode;