1

我正在尝试将简单的文本数据提交到多部分形式的 CGI。

问题是..我不知道如何格式化表单数据！

简而言之，我的系统准备一个包含 post 数据的字符串，使用 request.GetRequestStream() 创建一个 streamwriter，然后将 post string 直接写入该 streamwriter。然后它继续关闭流写入器，并发送请求。

我尝试将字符串格式化为：“Param1=sometext¶m2=sometext”，但我得到了返回错误：

Unhandled Exception: System.Net.WebException: The remote server returned an error: (417) Expectation Failed.
  at System.Net.HttpWebRequest.CheckFinalStatus (System.Net.WebAsyncResult result) [0x002d9] in /private/tmp/monobuild/build/BUILD/mono-2.8/mcs/class/System/System.Net/HttpWebRequest.cs:1425 
  at System.Net.HttpWebRequest.SetResponseData (System.Net.WebConnectionData data) [0x00143] in /private/tmp/monobuild/build/BUILD/mono-2.8/mcs/class/System/System.Net/HttpWebRequest.cs:1250

显然我的字符串格式错误，但我一生都无法弄清楚如何正确地这样做。

有人可以启发我吗？:)

编辑，我也尝试更改request.ContentType = "application/x-www-form-urlencoded";为request.ContentType = "multipart/form-data";. 这无济于事，但我将就这样离开它。

编辑：完整代码：

public static string sendReq (string url, string pdata)//Pdata is the string containing form data
{
    StringBuilder sb  = new StringBuilder();
    byte[] buf = new byte[8192];
    HttpWebRequest request  = (HttpWebRequest) WebRequest.Create(url);
    CookieCollection jar = new CookieCollection();
    jar.Add(new Cookie("Cookie","Data","Removed","For privacy."));
    jar.Add(new Cookie("Cookie","Data","Removed","For privacy."));
    jar.Add(new Cookie("Cookie","Data","Removed","For privacy."));
    jar.Add(new Cookie("Cookie","Data","Removed","For privacy."));
    jar.Add(new Cookie("Cookie","Data","Removed","For privacy."));
    l("Loading cookie jar onto request");
    CookieContainer cont = new CookieContainer();
    cont.Add(jar);
    request.CookieContainer = cont;
    if (pdata != "")
    {
        request.Method = "POST";
        request.ContentType = "multipart/form-data;";
        request.ContentLength = pdata.Length;
        StreamWriter stOut = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);
        stOut.Write(pdata);
        stOut.Close();
    }
    HttpWebResponse response = (HttpWebResponse) request.GetResponse();
    Stream resStream = response.GetResponseStream();
    string tempString = null;
    int count = 0;
    do
    {
        count = resStream.Read(buf, 0, buf.Length);
        if (count != 0)
        {
            l("Data was read. ["+count+" bytes]. Encoding to ASCII");
            tempString = Encoding.ASCII.GetString(buf, 0, count);
            l("Appending to full string");
            sb.Append(tempString);
        }
    }
    while (count > 0);
    return sb.ToString();
}

处理发送帖子数据的代码部分：

if (pdata != "")
    {
        request.Method = "POST";
        request.ContentType = "multipart/form-data;";
        request.ContentLength = pdata.Length;
        StreamWriter stOut = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);
        stOut.Write(pdata);
        stOut.Close();
    }
    HttpWebResponse response = (HttpWebResponse) request.GetResponse();
4

1 回答 1

2

尝试：

System.Net.ServicePointManager.Expect100Continue = false;

很明显，HttpWebRequest默认添加了Expect头，这让很多服务器感到困惑。

更新：

还原为：

request.ContentType = "application/x-www-form-urlencoded";

因为当前的内容类型和正文中的数据组合不匹配。

于 2010-12-31T23:09:25.097 回答