title: Opinion about synchronous requests in web workers
body: <p>I want to know what do you think about this. Is recommended to use synchronous requests (XMLHttpRequest) in a web worker? What problems can I find?</p>
  
  <p>I have been testing this in my app and I haven't find any trouble. But I'm afraid of this synchronus behaviour because of old experiences with jQuery and AJAX.
  My app gets a big amount of data from several tables in a database, and this requires a time. For each bunch of data retrieved from a table, I need to instantly process it to not delay the whole thing too much. Meanwhile, the user is interacting with the browser, so it can be blocked, and I thought that web workers would work fine.
  Do you thing that this is a good solution? Or should I try with asynchronus requests?</p>
  
  <p>Thank you.</p>