Zenodo restriction over 'zen4R' user-agent

[eblondel]

For some reasons, Zenodo seems to be restricting zen4R calls based on the User-Agent, when containing 'zen4R' or other patterns (for which validation rule is not clear).

Proof:

httr::HEAD("https://zenodo.org/api/records/?q=conceptdoi:10.5281//zenodo.2547036&size=10&page=1&all_versions=1", httr::add_headers("User-Agent" = "zen4R"))

gives error 500

httr::HEAD("https://zenodo.org/api/records/?q=conceptdoi:10.5281//zenodo.2547036&size=10&page=1&all_versions=1", httr::add_headers("User-Agent" = "R"))

gives 200