If you use knit2wp to a site that has good transport-security configuration--meaning it doesn't permit obsolete transport-security protocols--you will get an error. By "obsolete transport security", I mean any transport-security protocol other than TLS 1.2 or 1.3 (more info).

The ultimate problem is with the RCurl package, which this function depends on for data-transport. The error can reliably be reproduced with a trivial example, such asRCurl::getURL("http://www.arencambre.com/").

The below sites will produce an error. They are verified athttps://gf.dev/tls-scanner as not supporting anything lower than TLS 1.2:

• https://www.smu.edu/
• https://www.rstudio.com/
• https://www.arencambre.com/
• https://en.wikipedia.com/
• https://www.harvard.edu/

Note that knit2wp depends on these packages:

• RWordPress (latest commit is August 2012)
• XMLRPC, which RWordPress uses to interact with WordPress.
• RCurl, which XMLRPC uses for the actual communications with WordPress. Arelevant issue was reported to RCurl in November 2018, but there is no apparent action on it. I also opened amore general issue, similar to this one.

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