最近研究了下如何抓取為知筆記的內容，在抓取筆記裏的圖片內容時，老是提示403錯誤，用Chorme的開發者工具看了下：

這裏的Cookie來自兩個域，估計為知那邊是驗證了token(登錄後才能獲取到token)

下載圖片的代碼：

1. var path = "https://note.wiz.cn/" + str.TrimStart(‘/‘);
2. var extension = Path.GetExtension(path);
3. var filepath = AppPath.Combine("Images/" + DateTime.Now.Ticks + extension);
5. const string userAgent ="Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.76 Safari/537.36";
6. const string accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
7. const string acceptLanguage = "zh-CN,zh;q=0.8";
8. const string acceptEncoding = "gzip,deflate,sdch";
9. var cookieContainer = new CookieContainer();
10. var cookie = new Cookie
11. {
12. Name = "token".Trim(),
13. Value = Token,
14. Domain = ".wiz.cn".Trim() //設置cookie域
15. };
16. cookieContainer.Add(cookie);
17. string[] cookiesArr = txtCookie.Text.Split(‘;‘);
18. foreach (string s in cookiesArr)
19. {
20. string[] keyValuePair = s.Split(‘=‘);
21. if (keyValuePair.Length > 1)
22. {
23. cookie = new Cookie
24. {
25. Name = keyValuePair[0].Trim(),
26. Value = keyValuePair[1].Trim(),
27. Domain = "note.wiz.cn" //設置cookie域
28. };
29. cookieContainer.Add(cookie);
30. }
31. }
33. var newUri = new Uri(path);
34. var webRequest = (HttpWebRequest)WebRequest.Create(newUri);
35. webRequest.Timeout = 20000;
36. //webRequest.CookieContainer = cookieContainer;
37. webRequest.UserAgent = userAgent;
38. webRequest.Accept = accept;
39. webRequest.Headers["Accept-Language"] = acceptLanguage;
40. webRequest.Headers["Accept-Charset"] = acceptEncoding;
41. webRequest.Headers["Accept-Encoding"] = acceptEncoding;
42. webRequest.KeepAlive = true;
43. webRequest.Headers["Cache-Control"] = "no-cache";
44. webRequest.Headers["Upgrade-Insecure-Requests"] = "1";
45. webRequest.Headers["Pragma"] = "no-cache";
46. webRequest.Headers["Cookie"] = "token=" + Token + ";" + txtCookie.Text.Trim();//todo: Cookie 要這樣賦值，不能用CookieContainer？？
48. webRequest.Referer = newUri.AbsoluteUri;
49. HttpWebResponse rsp = (HttpWebResponse)webRequest.GetResponse();
51. Stream stream = null;
52. stream = rsp.GetResponseStream();
53. Image.FromStream(stream).Save(filepath);
55. // 釋放資源
56. if (stream != null) stream.Close();
57. if (rsp != null) rsp.Close();

奇怪的是：用 webRequest.CookieContainer = cookieContainer; 來跟cookie賦值，token參數總是賦不上，

後面改為：webRequest.Headers["Cookie"] = "token=" + Token + ";" + txtCookie.Text.Trim(); 就可以了，

CookieContainer 不是支持多個域的cookie嗎，難到跨域Cookie只能webRequest.Headers["Cookie"]這樣賦值嗎？ 沒弄明白，有知道的童鞋不吝賜教。

C# webrequest 抓取數據時，多個域Cookie的問題