=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 
Content-Type: image/gif
Connection: close
Content-Length: 42
Cache-Control: no-cache
Pragma: no-cache

Request headers
================
HEAD /e/ir?t=webm-22&amp;l=as2&amp;o=9&amp;a=B004KGW0M6 HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host: www.assoc-amazon.jp
Accept: */*
Referer: http://web-marketing.zako.org
Connection: close


Link is valid.