HttpWebRequest未发送标头

本文关键字：HttpWebRequest | 更新日期: 2023-09-27 18:23:38

我正在尝试用HttpWebRequest类模拟POST web请求：

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(<my url>));
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = data.Length;
        using (Stream stream = request.GetRequestStream())
        {
            stream.Write(data, 0, data.Length);
        }
        request.UserAgent = @"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)";

我需要为请求设置cookie。我尝试了很多方法：

request.Headers.Add(HttpRequestHeader.Cookie, GetGlobalCookies(<cookies url>));
 [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref uint pcchCookieData, int dwFlags, IntPtr lpReserved);
    const int INTERNET_COOKIE_HTTPONLY = 0x00002000;
    public static string GetGlobalCookies(string uri)
    {
        uint datasize = 1024;
        StringBuilder cookieData = new StringBuilder((int)datasize);
        if (InternetGetCookieEx(uri, null, cookieData, ref datasize, INTERNET_COOKIE_HTTPONLY, IntPtr.Zero)
            && cookieData.Length > 0) {
            return cookieData.ToString(); //.Replace(';', ',');
        }
        else
        {
            return null;
        }
    }

和

request.CookieContainer = new CookieContainer();
request.CookieContainer.SetCookies(new Uri(<my url>), GetGlobalCookies(<cookies-url>).Replace(';', ','));

GetGlobalCookies（）返回包含我需要的cookie的正确字符串。但在运行requist之后。GetResponse（）我在fiddler中的请求如下：

POST <my url> HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Host: <my host>
Content-Length: 3
Expect: 100-continue
Connection: Keep-Alive
i=1

如果我将Method更改为GET，则会正确发送cookie，但仍然没有用户代理：

GET <my url> HTTP/1.1
Cookie: ASP.NET_SessionId=uajwt1ybpde4hudwwizuq2ld
Host: <my host>
Connection: Keep-Alive

为什么HttpWebRequest不发送Cookie和用户代理标头？

HttpWebRequest未发送标头

好吧，我自己想好了。HttpWebRequest在调用GetRequestStream（）时构造请求体，因此在调用GetRequest Stream（）之前必须设置所有必需的头，否则它们将不会被发送。

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