C# winform 爬取一张url参数变化的图片

Question

图片的url在我爬取到后，再次用这个url去访问时，却访问不到了，也就是说图片的url的参数每次都在变化，但是图片没在变，就是productImg&s=a0p5VSt5MTNPaDBZR3RZVUVLOXNmbUxOSi9DblZFbHI=&w=63&h=28&fontSize=13&fontColor=2f3032&background=ffffff

&s=后面那串刷新一次变一次
byte[] by = null;
Uri uri = new Uri(path);
WebRequest webRequest;
HttpWebRequest request;
WebResponse response;
Stream stream;
Image image = null;
try
{
webRequest = WebRequest.Create(uri);
request = webRequest as HttpWebRequest;
response = request.GetResponse();
stream = response.GetResponseStream();
//报错
image = Image.FromStream(stream);
by = GetByteImage(image);
}
catch (Exception ex)
{
this.label7.Visible = true;
this.label7.Text = "图片地址：" + ex.Message;
}
return by;

Answer 1

应该有cookie，或者session验证，你捉去页面的时候注意用cookiecontainer获取这个页面返回的cookie信息，然后获取图片的http请求附加上这个cookiecontainer