I'm seeing this in the iis-logs of two websites that I maintain:
GET /an/existing/page/on/my/site+ForceRecrawl:+0 - 80 - 22.214.171.124 HTTP/1.1 Mozilla/5.0+(compatible;+bingbot/2.0;++http://www.bing.com/bingbot.htm)
I get about one or two of these per day from these IP addresses: 126.96.36.199, 188.8.131.52.. an more, all belonging to msnbot-ip.search.msn.com
Probably Microsoft has a bug in their crawler? Any way, doing a search on "ForceRecrawl: 0" in major search engines comes up with a bunch of random sites. Doing the search on StackOverflow or here gave no results (to my amazement). Am I the only one seeing this? I first noticed these on the 9th of this month, and I'm seeing them pass almost daily since...
Another thing that I think is crazy, is that the URL http://www.bing.com/bingbot.htm redirects to mail.live.com (hotmail).
Currently I'm returning 404's but I'm considering to catch these, strip the trailing " ForceRecrawl: 0" and process as if it were a legitimate url.
Could anyone shed some light on this? Could it have to do with some configuration or so in Bing's Webmaster Tools?