Geo-Routing (Case Study on Craigslist) When you open craigslist.org it does a couple of redirection before finally landing on the subdomain closest to your city. Having separate sub-domain and listings for those particular cities is partly how it seems to handle the distribution of the content. (making it more scalable) Give it a try: https://craigslist.org Here is the journey of the request: curl -I craigslist.org HTTP/1.1 301 Found Location: https://www.craigslist.org/ redirected to https://www.