> Afaik, the content length header is not necessary, but it will cause > problems if it's set and it's wrong.
correct, missed Content-Length means the classic download with useless progress bar and undefined estimation time, problematic for preloader as well in case of images, swf, generic data, etc. Content_length should be always present and it should be correct, but obviously if there are print or echo or other outputs non file related, Content-Length can simply mess up the response. _________________________________________________________________ Windows Live: Friends get your Flickr, Yelp, and Digg updates when they e-mail you. http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/social-network-basics.aspx?ocid=PID23461::T:WLMTAGL:ON:WL:en-xm:SI_SB_3:092010