为什么使用 WebRequest 发送 post 数据需要这么长时间?

问题描述

我目前正在创建一个 C# 应用程序以连接到 php/MySQL 在线系统.应用程序需要将发布数据发送到脚本并获得响应.

当我发送以下数据时

用户名=测试&密码=测试

我收到以下回复...

开始请求于 22/04/2010 12:15:42完成创建请求:采取 00:00:00.0570057传输数据于 22/04/2010 12:15:42传输数据:采取了 00:00:06.9316931 <<--在 22/04/2010 12:15:49 得到回复得到回应 00:00:00.0360036完成响应 00:00:00.0360036整个通话时间为 00:00:07.0247024

如您所见，实际将数据发送到脚本需要 6 秒，我已经完成了进一步测试，再见，从 telnet 发送数据，并将发布数据从本地文件发送到 url，它们甚至不需要一秒钟所以这不是网站上托管脚本的问题.

为什么是两个简单的字符串，传输数据需要6秒?

我使用自定义类发送数据

class httppostdata{WebRequest 请求；WebResponse 响应；公共字符串senddata(字符串url，字符串postdata){var start = DateTime.Now;Console.WriteLine("开始请求" + start.ToString());//创建对传入参数的 url 的请求request = (WebRequest)WebRequest.Create(url);//设置发布方法request.Method = "POST";//设置内容类型和内容长度request.ContentType = "application/x-www-form-urlencoded";request.ContentLength = postdata.Length;//将帖子数据转换为字节数组byte[] byteData = Encoding.UTF8.GetBytes(postdata);var end1 = DateTime.Now;Console.WriteLine("完成创建请求:接受了" + (end1 - start));var start2 = DateTime.Now;Console.WriteLine("正在传输数据" + start2.ToString());//获取请求流并将数据写入其中流数据流 = request.GetRequestStream();dataStream.Write(byteData, 0, byteData.Length);数据流.关闭();var end2 = DateTime.Now;Console.WriteLine("传输的数据:取了" + (end2 - start2));//获取响应var start3 = DateTime.Now;Console.WriteLine("正在获取响应" + start3.ToString());响应 = request.GetResponse();//Console.WriteLine(((WebResponse)response).StatusDescription);dataStream = response.GetResponseStream();StreamReader reader = new StreamReader(dataStream);var end3 = DateTime.Now;Console.WriteLine("得到响应" + (end3 - start3));//读取响应字符串 serverresponse = reader.ReadToEnd();var end3a = DateTime.Now;Console.WriteLine("完成响应" + (end3a - start3));Console.WriteLine("整个通话结束了" + (end3a - start));//Console.WriteLine(serverresponse);reader.Close();数据流.关闭();response.Close();返回服务器响应；}}

我用它来称呼它

private void btnLogin_Click(object sender, EventArgs e){//字符串后数据；if (txtUsername.Text.Length 

解决方案

确保将 WebRequest 的代理属性显式设置为 null，否则它会尝试自动检测代理设置，这可能需要一些时间.

I am currently creating a C# application to tie into a php / MySQL online system. The application needs to send post data to scripts and get the response.

When I send the following data

username=test&password=test

I get the following responses...

Starting request at 22/04/2010 12:15:42
Finished creating request : took 00:00:00.0570057
Transmitting data at 22/04/2010 12:15:42
Transmitted the data : took 00:00:06.9316931       <<--
Getting the response at 22/04/2010 12:15:49
Getting response 00:00:00.0360036
Finished response 00:00:00.0360036
Entire call took 00:00:07.0247024

As you can see it is taking 6 seconds to actually send the data to the script, I have done further testing bye sending data from telnet and by sending post data from a local file to the url and they dont even take a second so this is not a problem with the hosted script on the site.

Why is it taking 6 seconds to transmit the data when it is two simple strings?

I use a custom class to send the data

class httppostdata
{
    WebRequest request;
    WebResponse response;

    public string senddata(string url, string postdata)
    {
        var start = DateTime.Now;
        Console.WriteLine("Starting request at " + start.ToString());

        // create the request to the url passed in the paramaters
        request = (WebRequest)WebRequest.Create(url);


        // set the method to post
        request.Method = "POST";
        // set the content type and the content length
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = postdata.Length;
        // convert the post data into a byte array
        byte[] byteData = Encoding.UTF8.GetBytes(postdata);
        var end1 = DateTime.Now;
        Console.WriteLine("Finished creating request : took " + (end1 - start));

        var start2 = DateTime.Now;
        Console.WriteLine("Transmitting data at " + start2.ToString());
        // get the request stream and write the data to it
        Stream dataStream = request.GetRequestStream();
        dataStream.Write(byteData, 0, byteData.Length);
        dataStream.Close();
        var end2 = DateTime.Now;
        Console.WriteLine("Transmitted the data : took " + (end2 - start2));


        // get the response
        var start3 = DateTime.Now;
        Console.WriteLine("Getting the response at " + start3.ToString());


        response = request.GetResponse();
        //Console.WriteLine(((WebResponse)response).StatusDescription);
        dataStream = response.GetResponseStream();
        StreamReader reader = new StreamReader(dataStream);
        var end3 = DateTime.Now;
        Console.WriteLine("Getting response " + (end3 - start3));

        // read the response
        string serverresponse = reader.ReadToEnd();
        var end3a = DateTime.Now;
        Console.WriteLine("Finished response " + (end3a - start3));

        Console.WriteLine("Entire call took " + (end3a - start));

        //Console.WriteLine(serverresponse);
        reader.Close();
        dataStream.Close();
        response.Close();

        return serverresponse;
    }
}

And to call it I use

private void btnLogin_Click(object sender, EventArgs e)
{
    // string postdata;

    if (txtUsername.Text.Length < 3 || txtPassword.Text.Length < 3)
    {
        MessageBox.Show("Missing your username or password.");
    }
    else
    {
        string postdata = "username=" + txtUsername.Text +
                          "&password=" + txtPassword.Text;

        httppostdata myPost = new httppostdata();
        string response = myPost.senddata("http://www.domainname.com/scriptname.php", postdata);
        MessageBox.Show(response);
    }
}

解决方案

Make sure you explicitly set the proxy property of the WebRequest to null or it will try to autodetect the proxy settings which can take some time.

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