c# - HttpWebRequest HTTP header

Question

我正在使用 HttpWebRequest 组件并尝试将数据发布到服务器。 当我使用浏览器时，我可以追踪到它发送了这个请求

POST https://plus.google.com/_/socialgraph/mutate/modifymemberships/?_reqid=1950158&rt=j HTTP/1.1
Host: plus.google.com
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:8.0.1) Gecko/20100101 Firefox/8.0.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-gb,en;q=0.5
Accept-Encoding: gzip, deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection: keep-alive
X-Same-Domain: 1
Content-Type: application/x-www-form-urlencoded;charset=utf-8
Referer: https://plus.google.com/_/apps-static/_/js/home/b,s/rt=h/ver=OeD97kiQfn8.en./sv=1/am=!iPoVWvyH1UcKPT9bc1pNSZLcSj8oHAelto24gJorhwk/d=1/
Content-Length: 216
Cookie: PREF=ID=c42cff62752fc3e8:U=dae37ffa177e0689:FF=0:TB=2:LD=en:CR=2:TM=1244434765:LM=1311323210:DV=0SJoub_nzRUL:GM=1:S=EuE8opfqNl8PGGHI; NID=54=enDovqVn7CSHrPtZ2ZSPAt4PrE0ZZE-rWJawva2NiUWC1TzreG-sVdiSnRp7kolqcvMCGCIKt7agHKT6Hi2JZkV5qYmY_fUkxFjk6PUc7TrdNRAT7_9mRnvwOxeBOcng; rememberme=false; __utma=1.340991765.1324442547.1324723420.1324806933.8; __utmz=1.1324723420.7.7.utmcsr=google.com|utmccn=(referral)|utmcmd=referral|utmcct=/accounts/Logout2; OTZ=1044056_4_4_133320_8_385320; S=analytics-realtime-frontend=h23QCGj_I9O7FLG9cqDjkA:awfe=SnIt_U1wxuihQ1myCwuiZA:awfe-efe=lCXLSEuiUzX3HyaRuXVuRg:adwords-optimization=yCZeLrx1FD0uGQFYb07LTQ:adwords-common-ui=WfNukVX7rVpTuVtMlZ6IbA; S_awfe=tyb6VRVQyBHkv8nbfMNWRg; GMAIL_RTT=571; __utmc=1; HSID=AtaMO-oLk9-OMZkiv; SSID=AGt3gDSdd3Q98pA81; APISID=7xRgosYs7uOXzd0Y/AI4OXaHRTViR8oE8s; SAPISID=0HNI_ffNupNL-UfT/Ao6YbG5vkEashPdOM; ULS=EgYKBBICZW4Yy-Xb9wQ; SID=DQAAALMAAADk5OelxcPoQKO8FrSoOfOGoTHX4HeVfeJJQhtd19k07mJMUhJkiehF1FTzb7jNt34c80UGpyXEJT5FML373p6RR_5EQ3etVYjUXmgqHsdO7G-XuP_k_m798MDvd4AWkDX2vKVtqc5zA_olxB9UkJBLU_g2IM2vZ3Scp-eThZj8C3uZuzdN_DCpQeVjrU6a1kiIdQRsz9rUtxzoC0E22Ux4ba0QneaWBT73Ns14wh7fqZtYB-DRB2zcWkXXoNnV67U; FBS_VI_1324806859_0=ot_00Qg-hkQV7uhIEb0dTMT0_DD6aAI
Pragma: no-cache
Cache-Control: no-cache

a=%5B%5B%5B%225947b6d78a8231f3%22%5D%5D%5D&m=%5B%5B%5B%5Bnull%2Cnull%2C%22113690702042497323038%22%5D%2C%22Stephanie%20Parker%22%2C%5B%5D%5D%5D%5D&r=%5B%5B%5D%5D&at=AObGSAg06IXl5iYSceecKRc64xHVAB_GDw%3A1324806859000&

当我使用 HttpWebRequester 时，它会发送以下数据，导致代码 400 而不是代码 200

POST https://plus.google.com/_/socialgraph/mutate/modifymemberships/?_reqid=1950158&rt=j HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:8.0.1) Gecko/20100101 Firefox/8.0.1
Accept-Language: en-gb,en;q=0.5
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
X-Same-Domain: 1
Content-Type: application/x-www-form-urlencoded;charset=utf-8
Referer: https://plus.google.com/_/apps-static/_/js/home/b,s/rt=h/ver=OeD97kiQfn8.en./sv=1/am=!iPoVWvyH1UcKPT9bc1pNSZLcSj8oHAelto24gJorhwk/d=1/
Pragma: no-cache
Cache-Control: no-cache
Host: plus.google.com
Cookie: ULS=EgYKBBICZW4Yp_7k9wQ; SID=DQAAALYAAAAZuUVe6hDQbW__dA1Itrcz8thm2Ncxk5YFMfpeiKyr6Pps1Pu0ajmReczMDHKGnDpk3yrx7WFy-5QMOf0Fu4WiPVdUWcU_cLNfD7FhKtqmSmOgFiffTkyj8dg0bsTeahhrKR7j75rjU_eXqGnQI2qcJHOyk1cLEkWNaWyLRGeYDrsfAh6uzx4AI-1GtKbwwrE7UHsn_sUFG1DuwI_Ct_g9C2llFVVyQruvFnlmRE1xDE_ORwvnBYCrGQYjyt1blg8; HSID=AbkExs5EzrPodpoKx; SSID=A2y_-xD7iOhW9Y2HF; APISID=73YQ7BugDgjmMSdd/AgFF1ClZc0z-fpPGM; SAPISID=mT6qzvCACzlvDrg-/AN1ajSgZCB0R9xOmX
Content-Length: 216
Connection: Keep-Alive

a=%5b%5b%5b%225947b6d78a8231f3%22%5d%5d%5d&m=%5b%5b%5b%5bnull%2cnull%2c%22113690702042497323038%22%5d%2c%22Stephanie%20Parker%22%2c%5b%5d%5d%5d%5d&r=%5b%5b%5d%5d&at=AObGSAg06IXl5iYSceecKRc64xHVAB_GDw%3a1324806859000&

那么知道为什么类似的请求会有 2 个不同的服务器响应吗？

顺便说一句，我确实检查过 cookie，它们都很好。我只是对为什么我的请求不起作用感到困惑。

更新 添加请求代码

webRequest_ = (HttpWebRequest)HttpWebRequest.Create(Params.URL);

webRequest_.Method = "POST";
//webRequest_.Proxy = new WebProxy("http://plus.google.com", false);
webRequest_.UserAgent = Params.UserAgent;
webRequest_.Headers.Add("Accept-Language", "en-gb,en;q=0.5");
webRequest_.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
webRequest_.Headers.Add("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
webRequest_.KeepAlive = true;
webRequest_.Headers.Add("X-Same-Domain", "1");
webRequest_.ContentType = "application/x-www-form-urlencoded;charset=utf-8";
webRequest_.Referer = "https://plus.google.com/_/apps-static/_/js/home/b,s/rt=h/ver=OeD97kiQfn8.en./sv=1/am=!iPoVWvyH1UcKPT9bc1pNSZLcSj8oHAelto24gJorhwk/d=1/";
webRequest_.CookieContainer = Params.Cookie;
webRequest_.Headers.Add("Pragma", "no-cache");
webRequest_.Headers.Add("Cache-Control", "no-cache");

var sp = webRequest_.ServicePoint;
var prop = sp.GetType().GetProperty("HttpBehaviour", BindingFlags.Instance | BindingFlags.NonPublic);
prop.SetValue(sp, (byte)0, null);

var parameters = new StringBuilder();

foreach (var key in Params.Params)
{
    parameters.AppendFormat("{0}={1}&", HttpUtility.UrlEncode(key.ToString()),
       HttpUtility.UrlEncode(Params.Params[key.ToString()]).Replace("+","%20"));

}

using (var writer = new StreamWriter(webRequest_.GetRequestStream()))
{
    writer.Write(parameters.ToString());
}

Answer 1

经过大量测试后，我发现问题不在标题中，而是在发布的数据中，特别是在代表 session ID 的“at”参数中。成功生成 session ID 后，它确实很有魅力。