What kind of request did you make? What is the server? "202 Accepted" is usually used for POSTs that accept requests but don't return response. For fetching an image, this is an odd response to get.

It is possible that LWP::UserAgent is doing something wrong. Try using the lwp-request commands and dump out the request and reponse. Try writing out the request and response headers in your code. Also try telnet'ing to port 80 and doing a HTTP request manually.

lwp-request -m GET -U -S -e $url
[download]