title: http handlers and modules: what's a good example of a problem they solve?
body: <p>I got this in an interview question -- the question was more about what they do, which I didn't know beyond very vague terms. But after reading about them I'm still no closer to an understanding of <strong>what problems I would solve with an HttpHandler or HttpModule</strong>. I've worked a fair amount in ASP.NET but it's been a few years -- is this a large gap in my knowledge? Something that's been replaced by more current technology? </p>
  
  <p>Clarification: what's a common problem in the ASP.NET world that would be much easier to solve with an HttpHandler as opposed to something you'd do in a webservice or an ajax call? </p>