Question

我在C＃中有这段代码：

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.ContentType = "application/x-www-form-urlencoded";
request.Timeout = 30000; 
request.Method = "POST"; 
request.KeepAlive = true;
request.AllowAutoRedirect = false;

Stream newStream = request.GetRequestStream();
newStream.Write(bPostData, 0, bPostData.Length);

byte[] buf = new byte[1025]; int read = 0; string sResp = "";
HttpWebResponse wResp = (HttpWebResponse)request.GetResponse();
Stream resp = wResp.GetResponseStream();

行HttpWebResponse wResp =...只是挂起（因为没有来自URL的响应）。我不确定它到底崩溃的原因（因为我甚至没有得到异常错误）。我在IE中测试了URL，它运行正常。我还检查了bPostData，其中有一个数据。哪里出错了？

Answer 1

尝试在变量newStream中关闭请求流。也许API等待它完成。

Answer 2

你必须增加限制：

ServicePointManager.DefaultConnectionLimit = 10; // Max number of requests

Answer 3

尝试简化代码并伪造用户代理。也许该网站阻止/限制刮刀/机器人。还要确保正确编码application/x-www-form-urlencoded HTTP POST值。为此我建议你WebClient：

using (var client = new WebClient())
{
    client.Headers[HttpRequestHeader.UserAgent] = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0";
    var values = new NameValueCollection
    {
        { "param1", "value1" },
        { "param2", "value2" },
    };
    byte[] result = client.UploadValues(url, values);
}

Answer 4

当我早些时候发表评论时，我已经在我的办公室运行了你的代码（严重防火墙）我得到了你所做的相同结果。回到家，再次尝试（减少防火墙）它工作得很好......我猜你在那里有一个障碍。我相信你正面临防火墙问题。

Answer 5

使用content-length = 0

示例：

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(URL);
        request.Method = "POST";
        request.ContentLength = 0;
        var requestStream = request.GetRequestStream();
        HttpWebResponse res = (HttpWebResponse)request.GetResponse();
        res.Close();

c＃中的getResponse不起作用。没有回复

5 个答案: