本当の動きは
HTTP/1.1 302 Moved Temporarily Location: http://b.hatena.ne.jp/images/users/normal/00036.png
GET /users/normal/00036.png Host: b.hatena.ne.jp
HTTP/1.1 200 OK Content-Type: image/png Etag: "d7a218-1f9-f35b8700" binary data
HTTP/1.1 302 Moved Temporarily Location: http://b.hatena.ne.jp/images/users/normal/00036.png
GET /users/normal/00036.png Host: b.hatena.ne.jp
HTTP/1.1 200 OK Content-Type: image/png Etag: "d7a218-1f9-f35b8700" binary data