title: How do I check presence of web pages by making changes to a URL, please see details?
body: <p>If we have a URL :</p>
  
  <pre><code>https://www.example.com/123.html
  </code></pre>
  
  <p>I wish to check if other web pages are present by changing certain portion of URL , in this case we can do by changing numbers.</p>
  
  <p>Hence :</p>
  
  <pre><code>https://www.example.com/124.html 
  </code></pre>
  
  <p>So how can i do it , say run a script , which checks presence of web pages in this directory by changing , in this case , last three numbers , say from 000 to 999 ?</p>