On Thu, 30 Jun 2022 10:00:53 +1000
Greg Hunt <g...@firmansyah.com> wrote:

> With a little more experimenting, the 503 response from the wiley DOI
> lookup does seem to come from CloudFlare, there is a "server:
> cloudflare" header.

Unfortunately, CloudFlare also returns the 503 status code with the
"server: cloudflare" header in case of connectivity issues between
CloudFlare and the upstream server:
https://support.cloudflare.com/hc/en-us/articles/115003011431/#503error

-- 
Best regards,
Ivan

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