Cookies on localhost with explicit domain

I must be missing some basic thing about cookies. On localhost, when I set a cookie on server side and specify the domain explicitly as localhost (or .localhost). the cookie does not seem to be accepted by some browsers. Firefox 3.5: I checked the HTTP request in Firebug. What I see is: Set-Cookie: name=value; domain=localhost; expires=Thu, 16-Jul-2009 21:25:05 GMT; path=/ or (when I set the domai

[kkeisuke]

“When working on localhost, the cookie domain must be omitted entirely. Just setting it to "" or NULL or FALSE instead of "localhost" is not enough.”

[mapserver2007]

はまったので。

[coppieee]

cookieを保存するdomainがlocalhostの場合、"" or false or null を入れましょうというお話。