It's worth noting that Hacker News seems to temporarily block IP addresses if to...

liamk on March 8, 2012 | parent | context | favorite | on: Scraping Web Pages With jQuery, Node.js and Jsdom

It's worth noting that Hacker News seems to temporarily block IP addresses if too many requests are made. I'm not sure if it's requests per minute, or within an hour. But my IP was blocked 3 times when playing around with a similar script.