A lookup by ISBN took the year, publisher, language and page count from
Open Library's index, which answers for the work and gathers them from
every edition: Penguin's English War and Peace came back Spanish,
Norton's, and 1845. The index now gives only the title, the authors and
the subjects, and the edition record the rest (#6).
A cover must run to its end marker, FF D9 for a JPEG and IEND for a PNG,
so a body that only starts like an image is refused (#4). A relative
redirect whose query holds another address is resolved as relative (#5).
Closes#4, #5, #6.