How to Simulate Long HTTP Requests

By  on  

It happens less frequently these days but there are times when we need to accommodate for a HTTP request timing out. The service could be down, under heavy traffic, or just poorly coded, or any host of other issues.

Whenever I need to simulate a long HTTP request, I use a bit of PHP to make it happen:

<?php
        // Don't resolve this request for 5 seconds
        sleep(5);
        
        // A generic response
        echo 'This is the response!';

        // ... or hit a URL to make the case more realistic
        echo file_get_contents('https://website.tld/endpoint');
?>

With that script created, I make PHP start a server so I can make the request locally:

php -S localhost:8000

Now I can hit http://localhost:8000 and get the long request I want!

There are a number of ways you can accomplish these long form requests but this has always been a favorite of mine!

Recent Features

  • By
    fetch API

    One of the worst kept secrets about AJAX on the web is that the underlying API for it, XMLHttpRequest, wasn't really made for what we've been using it for.  We've done well to create elegant APIs around XHR but we know we can do better.  Our effort to...

  • By
    Chris Coyier&#8217;s Favorite CodePen Demos

    David asked me if I'd be up for a guest post picking out some of my favorite Pens from CodePen. A daunting task! There are so many! I managed to pick a few though that have blown me away over the past few months. If you...

Incredible Demos

Discussion

  1. That’s cool! Thanks for the tip.
    I could see having it take a query param to set the sleep time arbitrarily for different scenarios you’re simulating.

  2. Charlie

    Thanks David always love your content.
    Although in this particular case i fail to understand a practical use, could you share an example?

    thanks !

  3. Dima

    And here is concise way to do it in NodeJs, the server will wait for 3 seconds before response:

    const http = require('http')
    
    const server = http.createServer((req, res) => {
      setTimeout(() => {
        res.writeHead(200)
        res.end('Hello, World!')
      }, 3000)
    })
    server.listen(8080)
    

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!