title: How to check if a file exists on an webserver by its URL?
body: <p>in our application we have some kind of online help. It works really simple: If the user clicks on the help button a URL is build depending on the current language and help context (e.g. "<a href="http://example.com/help/" rel="nofollow noreferrer">http://example.com/help/</a>" + [LANG_ID] + "[HELP_CONTEXT]) and called within the browser.</p>
  
  <p>So my question is: How can i check if a file exists on the web server without loading the complete file content?</p>
  
  <p>Thanks for your Help!</p>
  
  <p><strong>Update: Thanks for your help. My question has been answered.
  Now we have proxy authentication problems an cannot send the HTTP request ;)</strong></p>