How can I delay an HTTP response for x seconds?
I won't go into the boring details of why I need this, it's part of an internal analytics package, but my goal is to create an ASP.NET page that returns a redirect after 2 seconds.
The problem I'm seeing is that using Thread.Sleep(2000)开发者_如何学Python; is going to hold up one of my ASP.NET ThreadPool threads. As I understand it, this is pretty wasteful as thread creation isn't cheap and I need this server to handle as many possible simultaneous connections as possible.
So, what's the best way to have HTTP GETs to my page return after at least 2 seconds (over 2 seconds is no problem, it just can't be under).
protected void Page_Load(object sender, EventArgs e)
{
Thread.Sleep(2000);
Response.Redirect(RedirectUri);
}
EDIT
I should clarify, the requested page is actually requested as an image, so returning HTML isn't possible. It'll be used like so:
<img src="http://hostname/record.aspx"/>
The redirect to an actual image should take 2 seconds.
You can do this on the markup itself, you can put something like:
<head>
<meta http-equiv="refresh" content="3; URL=otherpage.aspx">
</head>
You could implement IHttpAsyncHandler. See MSDN.
Do it in JS:
setTimeout(function() {
$.ajax({url: './script.aspx'});
},2000);
There is no way simple way to delay program execution without holding up a thread. You could in theory set up a a delay at the other server where the Re-Direct is occurring, but if you are just trying to cause a delay or timeout prior to the Redirect, you'll have to pay the penalty of a waiting thread.
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