It's a malformed request header sent by the client. It's not related to If-Modified-Since or the requested URL.
Regards Henrik On Fri, 2008-03-28 at 15:45 -0400, Allen Schmidt Sr. wrote: > Malformed by the msnbot? The URLs noted in the log are all correct. Some > are whacked because of the virtual hosted structure of domains that live > inside our Zope site. > > Henrik Nordstrom wrote: > > > It's not related. This is a malformed HTTP request. > > > > On Fri, 2008-03-28 at 15:24 -0400, Allen Schmidt Sr. wrote: > > > >>I am seeing this and wonder if this is related: > >> > >> > >>2008/03/28 15:17:49| WARNING: Blank continuation line in HTTP header > >>{Accept: text/html, text/plain, text/xml, application/*, Model/vnd.dwf, > >>drawing/x-dwf > >>Host: fredericksburg.com > >>Accept-Encoding: gzip, deflate > >>From: msnbot(at)microsoft.com > >>If-Modified-Since: Sun, 09 Mar 2008 14:31:17 GMT > >> > >>User-Agent: msnbot/1.1 (+http://search.msn.com/msnbot.htm) > >>Connection: Close > >>} > >>2008/03/28 15:17:49| Failed to parse request headers: > >>http://fredericksburg.com:80/News/FLS/2008/032008/03062008/361232 > >>GET /News/FLS/2008/032008/03062008/361232 HTTP/1.1 > >>Accept: text/html, text/plain, text/xml, application/*, Model/vnd.dwf, > >>drawing/x-dwf > >>Host: fredericksburg.com > >>Accept-Encoding: gzip, deflate > >>From: msnbot(at)microsoft.com > >>If-Modified-Since: Sun, 09 Mar 2008 14:31:17 GMT > >> > >>User-Agent: msnbot/1.1 (+http://search.msn.com/msnbot.htm) > >>Connection: Close > >> > >> > >> > >>I have been seeeing these all day almost continuously. > >> > >>Thanks > >> > >>Allen > > > > > > > >