title: Correct handling of ASP.NET-pages when scraping
body: <p>I am scraping a certain ASP.NET-enabled search page from a Python script and running into trouble getting the data I want from postbacks.</p>
  
  <p>So I want to verify if I've got ASP.NET related bits correctly before ruling it out.</p>
  
  <p>So far I just take all hidden form variables (e.g. <code>__VIEWSTATE</code>) and send them with other POST request parameters. <strong>Is this correct or they should change in some way?</strong> POST response contains updated hidden variables, which I assume should become parameters of the next postback, however when I browse the same page in Firefox, not all hidden form fields posted back are the same (e.g. <code>__EVENTTARGET</code> and <code>__EVENTARGUMENT</code>).</p>
  
  <p><strong>Do I need any other special handling here or this is all there is to it?</strong></p>