There have been many questions about the Stack Overflow sitemap, but this question is not like those. My goal is not to figure out how the sitemap works, I just want to look at it (don't worry, I'm not going to abuse it, like the issue here!). I looked at http://stackoverflow.com/robots.txt and found the reference to http://stackoverflow.com/sitemap.xml, but I get a 404 when I try to access the sitemap. How does this work? Can you explain where the sitemap is? I see a comment in
robots.txt that that reference to sitemap.xml isn't technically valid - if the real reference is in another place, what is this place? (Also, this question may belong on a different site, please migrate it if so.) Thanks!
UPDATE: From the answers, I've concluded that the sitemap is actually at
http://stackoverflow.com/sitemap.xml, but access is restricted to only googlebots. Thanks!