What is WARNING: suspicious CR characters in HTTP header ?

Hi,

What is WARNING: suspicious CR characters in HTTP header ?
Say, what is wrong in
"Set-Cookie: sbtpoll1067196868\r=1067196868\r; path=/; expires=Tue,
15-Feb-2005 15:31:46 GMT\r\nLocation:
http://www.metallica.kiev.ua/\r\nConnection: close\r\nContent-Type:
text/html; charset=iso-8859-1\r\n\r\n"

And why in case of "suspicious CR characters " header is not
  developed propelly ?

I .e. why return is made in
-------8<---------------
             if (memchr(this_line, '\r', field_end - this_line)) {
                 debug(55, 1) ("WARNING: suspicious CR characters in
HTTP header near {%s}\n",
                     getStringPrefix(field_start, header_end));
//??EK return httpHeaderReset(hdr);
             }
-------8<---------------

SY,
Evgeny Kotsuba
Received on Mon Feb 14 2005 - 08:51:34 MST