Question

When I first make a HttpWebRequest in a Winform App, it takes 10~30 seconds to process the first request. Subsequent calls takes less than a second. I wrote a little POC app to exemplify this, it consists of two buttons and 2 textBoxes, an image of the app can be found here (I can’t upload images here yet…):

The app code is very simple:

public partial class Form1 : Form
{
    DateTime _start;
    TimeSpan _span;
    int _count = 0;
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void button1_Click(object sender, EventArgs e)
    {
        _count++;
        _start = DateTime.Now;
        HttpWebRequest _request = (HttpWebRequest)WebRequest.Create(textBox1.Text); ;
        // Added after Conrad's response:
        _request.CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
        HttpWebResponse _response = (HttpWebResponse)_request.GetResponse(); 
        _response.Close();
        _span = DateTime.Now - _start;
        textBox2.Text += _count.ToString("000") + ": " + _span.ToString(@"mm\:ss\,fff") + "\r\n";
    }

    private void button2_Click(object sender, EventArgs e)
    {
        textBox2.Text = "";
    }
}

Why does it take so long in the 1st request? There is something I can do to speed this up?

Answer 1

If you set the proxy property to null it will work as well, even without disabling the logical cards.

Source: HttpWebRequest runs slowly first time within SQLCLR