[R-pkg-devel] URL checks
With a little experimentation, the problem seems to be the -I switch in curl, with which the request uses the HTTP HEAD method instead of GET. Without -I, the requests from curl work for me; with -I, I get negative responses (403, 503). While HEAD does not represent a major security threat to a server it gets caught up when people are disabling unused or unnecessary operations and features and so at a first approximation, the problem is -I. Now, there may also be scraper blocking applied to the CRAN and WinBuilder infrastructure by the CDN companies, because scraping is a large problem for many websites, but detecting rejection by cloudflare may be possible if that is what is happening.
On Thu, 30 Jun 2022 at 07:08, Ivan Krylov <krylov.r00t at gmail.com> wrote:
On Wed, 29 Jun 2022 22:51:23 +0200 (CEST) William Becker <william.becker at bluefoxdata.eu> wrote:
if someone can point me to a reference where I can work out how to solve the problem, that would be really helpful
The CRAN URL checks page is linked from the CRAN policy: https://cran.r-project.org/web/packages/URL_checks.html Short version is, your links all seem fine, but Cloudflare and other content distribution companies don't like the way R checks them. You only need to mention that in the submission comment. There's no technical fix for the problem. DOI checks could be in theory adjusted (trading false negatives for false positives), but it's hard to get checks working for the rest of the links when the CDN companies decide that automated requests like ones produced by R CMD check are exactly the kind of thing they should be blocking. -- Best regards, Ivan
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