Lots of ISBNs not found #9
Description
Hi, I have the strange behavior that a lot of perfectly fine ISBNs are not found.
For example: 9783593508863 certainly exists:
https://www.worldcat.org/search?q=bn%3A9783593508863&qt=advanced&dblist=638
but $manifestation->findByIsbn("9783593508863"); will result in:
Client error: `GET http://experiment.worldcat.org/entity/work/data/4617044771.jsonld` resulted in a `404 Not Found` response:
--
| <html><head><title> - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-colo (truncated...)
| '
This happens with roughly half of the ISBNs in my test data.