[R-pkg-devel] URL checks

[Greg Hunt]

Ivan,
The question is whether the problem is that Cloudflare or other CDN vendors
are blocking the CRAN checks out or whether the problem is the use of
HEAD.  Clearly the use of HEAD causes failures when the requests do not
come from CRAN.  My comment below was just that at least in that case you
can see whether the request is being failed by CloudFlare and potentially
decide to disregard the failure.  Do you have evidence that even without
the use of HEAD that CloudFlare is rejecting the CRAN checks?

The CDN rejecting requests or flagging the service as temporarily
unavailable when there is a communication failure with its upstream server
is much the same behaviour that you would expect to see from the usual
kinds of protection that you'd apply to a web server (some kind of
filter/proxy/firewall) even without a CDN in place.

Greg

On Thu, 30 Jun 2022 at 17:26, Ivan Krylov <krylov.r00t using gmail.com> wrote:

> On Thu, 30 Jun 2022 10:00:53 +1000
> Greg Hunt <greg using 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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